Conquer the W Trek: Your Ultimate Self-Guided Patagonia Adventure
The W Trek in Torres del Paine National Park, Chilean Patagonia, is a pilgrimage for hikers worldwide. Its iconic ��W’ shape traces a path through glacial valleys, past towering granite spires, and alongside turquoise lakes. While many opt for guided tours, the W Trek is eminently achievable, and often more rewarding, as a self-guided adventure. This comprehensive guide will equip you with every detail needed to plan, book, and successfully complete the W Trek independently, offering unparalleled flexibility and a deeper connection with Patagonia's raw beauty.
Quick Answer: Is the Self-Guided W Trek For You?
Choose the self-guided W Trek if:
- ✓ You value independence and flexibility in your itinerary.
- ✓ You have prior multi-day trekking experience and are comfortable with self-sufficiency.
- ✓ You are physically fit and capable of carrying your own gear (or paying for porter services).
- ✓ You enjoy planning and managing your own logistics, including bookings and permits.
- ✓ You are budget-conscious and wish to reduce costs associated with guided tours.
Best For: Solo Travelers, Adventurous Couples/Friends, Experienced Hikers, Budget-Minded Explorers.
Myth vs. Reality: Self-Guided W Trek
Before diving into the specifics, let's address some common misconceptions about hiking the W Trek without a guide:
Myth: You need a guide for safety and navigation.
Reality: The W Trek is exceptionally well-marked, with clear signage at junctions and consistent trail maintenance by CONAF (Corporación Nacional Forestal), Chile's National Forest Corporation. While the weather can be unpredictable, the trail itself is not technically challenging for experienced hikers, and navigation is straightforward. Safety is paramount, but a guide is not a prerequisite; proper planning, appropriate gear, and adherence to park regulations are. Emergency services are accessible via refugios and park rangers.
Myth: Self-guided is significantly cheaper.
Reality: While self-guided *can* be cheaper, especially if you opt for camping and self-catering, the cost savings aren't always as dramatic as some expect, particularly if you prefer refuge stays and prepared meals. The primary cost savings come from eliminating guide fees and organized transport markups. However, you'll still pay for park entrance, transport to/from the park, accommodation (refugios or campsites), and food. Booking far in advance is crucial for securing better prices on accommodation and transport.
Myth: It's impossible to get permits and bookings independently.
Reality: It requires diligence and early planning, but it's entirely possible. The park's popularity means that accommodation (refugios and campsites) and park entrance tickets sell out months in advance, especially for peak season (December-February). The key is to understand the booking system, which involves multiple operators (Fantastico Sur and Las Torres Patagonia for refugios/campsites, and CONAF for park entrance and specific free campsites if available). This guide will detail the exact steps.
Best Time to Hike the W Trek Self-Guided
The W Trek is typically hiked between October and April, corresponding to the Patagonian spring, summer, and early autumn. Each season offers a different experience:
- Peak Season (December - February): This is Patagonian summer, offering the longest daylight hours (up to 16 hours) and generally the warmest temperatures (averaging 15-20°C/59-68°F). However, it's also the busiest time, requiring bookings 6-12 months in advance, and winds can be notoriously strong. Expect higher prices and crowded trails.
- Shoulder Seasons (October-November & March-April): These months offer a balance of milder weather, fewer crowds, and slightly lower prices. October/November showcases spring wildflowers, while March/April brings stunning autumn foliage. Temperatures are cooler (averaging 5-15°C/41-59°F), and weather is more unpredictable, but the experience can be more serene. Bookings are still essential, typically 3-6 months out.
Hyper-Local Insight: While December-February offers the best chance for 'good' weather, many experienced trekkers recommend late March for the golden Lenga tree foliage and significantly fewer people on the trails, provided you're prepared for cooler temperatures and potential early snow. Always check the official CONAF weather forecast before and during your trek.
Budgeting for Your Self-Guided W Trek
A self-guided W Trek can range significantly in cost depending on your choices regarding accommodation, food, and transport. Below is an estimated breakdown for a 5-day/4-night trek. All prices are approximate and subject to change; booking early often secures better rates.
- Park Entrance Fee (CONAF): ~CLP 49,000 (approx. USD 55-65 for non-Chileans). This is a one-time fee, typically paid online in advance via the official CONAF website aspticket.cl.
- Transport to/from Puerto Natales:
- Bus Punta Arenas Airport (PUQ) to Puerto Natales: ~CLP 10,000-15,000 (USD 11-17) one-way. (e.g., Bus Sur, Buses Fernández).
- Bus Puerto Natales to Torres del Paine (Laguna Amarga or Pudeto): ~CLP 10,000-15,000 (USD 11-17) one-way. (e.g., Bus Sur, Buses Gómez).
- Catamaran Pudeto to Paine Grande: ~USD 30-35 one-way. (Operated by Hielos Patagónicos hipsur.com).
- Shuttle Laguna Amarga to Welcome Center/Hotel Las Torres: ~CLP 3,000 (USD 3-4) one-way.
- Accommodation (per night):
- Camping (basic site only): ~USD 15-25 (CONAF free sites, if available, or paid sites at Fantastico Sur/Las Torres Patagonia).
- Camping (with tent/sleeping bag rental): ~USD 40-70.
- Refugio (dorm bed only): ~USD 50-80.
- Refugio (dorm bed + full board – breakfast, lunch, dinner): ~USD 120-180.
- Food:
- Self-Catering (dehydrated meals, snacks): ~USD 10-20 per day.
- Buying at Refugios (snacks, basic meals): Significantly more expensive, e.g., a beer can be USD 7-10, a sandwich USD 15-20.
- Gear Rental (if needed, per day in Puerto Natales):
- Tent: USD 10-15
- Sleeping Bag: USD 8-12
- Sleeping Pad: USD 5-8
- Trekking Poles: USD 3-5
Estimated Total Cost (5 days/4 nights):
- Budget Camper (self-catering, basic sites): USD 300-500
- Mid-Range (mix of camping/refugio, some prepared meals): USD 600-900
- Comfort-Oriented (refugio dorms, full board): USD 1000-1500+
These figures exclude international flights and pre/post-trek accommodation in Puerto Natales.
Permits & Booking Your Self-Guided Adventure
This is the most critical and often most stressful part of planning. All overnight stays within Torres del Paine must be booked in advance. There are no walk-up registrations. Failure to have confirmed bookings for every night will result in denied park entry or fines.
1. CONAF Park Entrance Ticket
Purchase your park entrance ticket online via aspticket.cl. Select "Torres del Paine" and your entry date. You will need to show this digital ticket (or printed copy) upon arrival at the park entrance (e.g., Laguna Amarga or Serrano). It's valid for multiple entries within your trek duration.
2. Accommodation Bookings (Refugios & Campsites)
The W Trek is managed by two primary concessionaires and CONAF for specific free campsites (which are often booked out months in advance or unavailable).
- Fantastico Sur: Operates Refugio & Camping El Chileno, Los Cuernos, Serón, Dickson, and Central. Book directly via their website: fantasticosur.com.
- Las Torres Patagonia (formerly Vertice Patagonia): Operates Refugio & Camping Paine Grande and Grey, and the Hotel Las Torres area. Book directly via their website: lastorres.com.
- CONAF Campsites: Occasionally, CONAF offers free campsites like Campamento Italiano (now a day-use area, no overnight camping) or Campamento Paso. These are extremely limited and require booking via the CONAF website, often opening much closer to the season or being fully booked by tour operators. For the W Trek, assume you will primarily use Fantastico Sur and Las Torres Patagonia sites.
Hyper-Local Insight: Due to different booking systems, you'll need to create accounts and book separately on Fantastico Sur and Las Torres Patagonia. Ensure your dates align perfectly to avoid gaps in accommodation. Start trying to book 6-12 months in advance for peak season. Be flexible with your dates if possible.
3. Sample Booking Strategy for the Classic W (East to West)
The most common direction for the W Trek is East to West, starting from Hotel Las Torres and ending at Paine Grande/Grey Glacier. This allows you to tackle the challenging Base Torres hike with a lighter pack on day one and finish with the stunning Grey Glacier.
Example Itinerary (5 Days/4 Nights):
- Night 1: Camping/Refugio Central (Fantastico Sur) or El Chileno (Fantastico Sur, closer to Base Torres).
- Night 2: Camping/Refugio Los Cuernos (Fantastico Sur) or Domos El Francés (Fantastico Sur).
- Night 3: Camping/Refugio Paine Grande (Las Torres Patagonia).
- Night 4: Camping/Refugio Grey (Las Torres Patagonia).
Once you have your accommodation confirmed, print all booking confirmations and keep them accessible on your phone.
Essential Gear for the Self-Guided W Trek
Packing correctly is crucial for comfort and safety, especially when you're carrying all your own gear. Patagonia's weather is famously unpredictable, often experiencing four seasons in one day.
Clothing (Layering System is Key):
- Base Layers: Merino wool or synthetic long-sleeve top and bottoms (moisture-wicking).
- Mid-Layers: Fleece jacket or synthetic puffy jacket for insulation.
- Outer Layers: Waterproof and windproof shell jacket and pants (essential!).
- Hiking Pants: Quick-drying, durable trekking pants (1-2 pairs).
- Shorts: Optional for warmer days.
- Socks: Several pairs of wool or synthetic hiking socks (avoid cotton).
- Hat: Sun hat, warm beanie/fleece hat.
- Gloves: Lightweight and waterproof gloves.
Footwear:
- Hiking Boots: Broken-in, waterproof, ankle-supporting hiking boots.
- Camp Shoes/Sandals: Lightweight for relaxing at refugios.
Camping Gear (if camping):
- Tent: 3-season or 4-season tent rated for high winds.
- Sleeping Bag: Rated for at least -5°C (23°F), preferably -10°C (14°F) for shoulder seasons.
- Sleeping Pad: Insulated and comfortable.
- Cooking System: Lightweight stove, fuel (can be bought in Puerto Natales), pot, utensils.
- Water Bottle/Hydration Reservoir: At least 2-liter capacity.
- Water Filter/Purifier: While water from streams is generally safe, purification is recommended.
Other Essentials:
- Backpack: 40-60 liter capacity, comfortable and well-fitted, with a rain cover.
- Headlamp/Flashlight: With extra batteries.
- First-Aid Kit: Comprehensive, including blister treatment, pain relievers, bandages.
- Sun Protection: Sunscreen, sunglasses.
- Navigation: Physical map and compass (even with well-marked trails), offline maps on phone (e.g., Maps.me, AllTrails).
- Power Bank: For charging electronics, as power outlets are limited.
- Toiletries: Biodegradable soap, small towel.
- Trash Bags: Pack it in, pack it out!
- Trekking Poles: Highly recommended for stability and reducing strain on knees.
- Identification: Passport, printed booking confirmations, park entrance ticket.
- Cash (CLP): For small purchases at refugios (though cards are often accepted).
Hyper-Local Insight: You can rent most gear in Puerto Natales, which can save you luggage space and weight. Check prices and reserve in advance, especially for peak season, as quality and availability vary. Reputable rental shops include Erratic Rock and Rental Natales.
W Trek Itinerary (Self-Guided, East to West)
This 5-day, 4-night itinerary is the most popular for the W Trek, offering a balanced pace and allowing you to experience all three valleys.
Day 0: Arrival in Puerto Natales
Arrive in Puerto Natales, check into your accommodation, and complete last-minute preparations: grocery shopping, gear rental pickup, and a final check of your bookings. Attend a free briefing at Erratic Rock (if available) for up-to-date trail conditions. Enjoy a hearty meal at a local restaurant. Patagonia Budget Guide
Day 1: Puerto Natales to Refugio/Camping Central or El Chileno (Base Torres)
- Morning: Take an early bus from Puerto Natales to Laguna Amarga (approx. 2.5 hours).
- Laguna Amarga: Show your CONAF park entrance ticket. Take the shuttle to Hotel Las Torres (Welcome Center) (approx. 15 minutes).
- Hike: From Hotel Las Torres, hike to Refugio Chileno (approx. 2 hours, 5 km). Drop your pack, then continue to the iconic Base de las Torres viewpoint (approx. 2 hours, 4 km, steep ascent).
- Return: Descend back to Refugio Chileno for the night, or continue to Refugio Central if you prefer a less strenuous first day.
- Total Hiking: 8-10 hours, 18-22 km (depending on where you stay).
- Overnight: Refugio/Camping El Chileno or Central (Fantastico Sur).
Day 2: Refugio/Camping El Chileno/Central to Refugio/Camping Los Cuernos
- Hike: From El Chileno, descend to Refugio Central, then continue along the beautiful Nordenskjöld Lake trail towards Los Cuernos. This section offers stunning views of the lake and the Cuernos del Paine (Horns of Paine).
- Total Hiking: 4-5 hours, 11-14 km.
- Overnight: Refugio/Camping Los Cuernos or Domos El Francés (Fantastico Sur).
Day 3: Refugio/Camping Los Cuernos to Refugio/Camping Paine Grande (French Valley)
- Hike: From Los Cuernos, hike to Campamento Italiano (approx. 2.5 hours, 7.5 km). This is now a day-use area where you can leave your main pack (at your own risk, though generally safe) and continue with a daypack into the French Valley.
- French Valley: Hike up the French Valley to Mirador Francés (1.5 hours one-way) for views of the Paine Grande massif and Glacier. For the full experience, continue to Mirador Británico (another 1.5-2 hours one-way), offering panoramic 360-degree views.
- Return & Continue: Return to Campamento Italiano, retrieve your pack, and continue to Refugio Paine Grande (approx. 2.5 hours, 7.5 km).
- Total Hiking: 8-12 hours, 20-25 km (depending on how far you go into the French Valley).
- Overnight: Refugio/Camping Paine Grande (Las Torres Patagonia).
Day 4: Refugio/Camping Paine Grande to Refugio/Camping Grey (Grey Glacier)
- Hike: From Paine Grande, hike along the shores of Lago Grey to Refugio Grey. This trail offers increasingly spectacular views of Grey Glacier as you approach.
- Total Hiking: 3.5-4 hours, 11 km.
- Afternoon: From Refugio Grey, you can take an optional walk to the first viewpoint of Grey Glacier (20-30 min one-way) or opt for activities like kayaking on Lago Grey or ice hiking on the glacier (pre-booked, additional cost).
- Overnight: Refugio/Camping Grey (Las Torres Patagonia).
Day 5: Refugio/Camping Grey to Puerto Natales
- Option 1 (Catamaran & Bus): Hike back from Refugio Grey to Paine Grande (3.5-4 hours, 11 km). From Paine Grande, take the catamaran across Lago Pehoé to Pudeto (approx. 30 minutes). At Pudeto, catch a bus back to Puerto Natales (approx. 2.5 hours).
- Option 2 (Boat Grey III & Bus): Take the Grey III boat from Refugio Grey across Lago Grey to Hotel Lago Grey (approx. 3 hours, pre-booked). From Hotel Lago Grey, a transfer can be arranged to connect with buses back to Puerto Natales. This is a scenic but more expensive option.
- Total Hiking: 0-4 hours.
- Total Travel: 4-7 hours.
Hyper-Local Insight: Always confirm catamaran and bus schedules in advance, as they can change seasonally or due to weather. The catamaran from Paine Grande to Pudeto is a critical connection and can fill up quickly. Arrive early.
Safety on the W Trek
While the W Trek is popular and well-maintained, it is still a wilderness environment. Personal safety and preparedness are paramount.
- Inform Someone: Let family or friends know your detailed itinerary.
- Stay on Marked Trails: Deviating from the path can lead to getting lost or disturbing fragile ecosystems.
- Weather Preparedness: Patagonia's weather changes rapidly. Carry layers, waterproofs, and be prepared for strong winds, rain, and even snow, regardless of the season.
- Water: While many streams are potable, always filter or purify water, especially near campsites.
- Fire Safety: Open fires are strictly prohibited in Torres del Paine National Park due to past devastating fires. Use only designated cooking areas with gas stoves.
- Wildlife: Maintain a safe distance from all wildlife, especially guanacos and pumas. Do not feed animals.
- Emergency Numbers: Save local emergency numbers (see below). Refugios have communication systems and can assist in emergencies.
- Physical Fitness: Ensure you are physically fit for multi-day trekking with a backpack.
- Leave No Trace: Pack out everything you pack in. Dispose of waste properly.
Weather & Climate
Torres del Paine is famous for its unpredictable weather, often experiencing all four seasons in a single day. The primary influences are its proximity to the Andes and the Southern Patagonian Ice Field.
- Temperatures: Summer (Dec-Feb) averages 10-20°C (50-68°F), but can drop to near freezing at night. Shoulder seasons (Oct-Nov, Mar-Apr) average 5-15°C (41-59°F).
- Wind: Strong winds (up to 120 km/h or 75 mph) are common, especially during summer. This can make hiking challenging and increase the perceived cold.
- Rainfall: Distributed throughout the year, but generally higher in autumn/winter. Be prepared for rain regardless of the season.
- Sun: The Patagonian sun is intense due to the thin ozone layer. Sunscreen, sunglasses, and a hat are vital.
Internet & Connectivity
Do not expect reliable or fast internet connectivity on the W Trek. This is part of the experience, allowing you to disconnect and immerse yourself in nature.
- Puerto Natales: Good 4G/5G coverage, Wi-Fi in hotels, cafes.
- Torres del Paine Park Entrance: Limited or no mobile signal.
- Refugios: Most refugios offer paid Wi-Fi, which is typically slow, expensive, and unreliable. Some may have limited satellite phone access for emergencies.
- Satellite Messenger/PLB: For true peace of mind and emergency communication in remote areas, consider renting or bringing a satellite messenger device (e.g., Garmin inReach, Zoleo).
Power Plugs & Charging
Chile uses Type L (three round pins) and Type C (two round pins) sockets. The standard voltage is 220V at 50Hz. Bring a universal adapter.
- Refugios: Limited power outlets are usually available in common areas, often for a fee, and may be turned off overnight. Expect long queues to charge devices.
- Campsites: No power outlets at campsites.
- Power Bank: An essential item for charging your phone, headlamp, and camera batteries throughout the trek. Consider a high-capacity power bank (20,000+ mAh).
Language
The official language of Chile is Spanish. While English is commonly spoken by staff in refugios, hotels, and tourist services in Puerto Natales and within Torres del Paine, less frequently will it be spoken in residential neighborhoods or smaller towns. Learning some basic Spanish phrases will enhance your experience and prove useful for interacting with bus drivers or local shopkeepers.
Currency
The official currency is the Chilean Peso (CLP). While many places in Puerto Natales and refugios accept credit/debit cards, carrying some cash (CLP) is advisable for smaller purchases, bus tickets, or in case card machines are down. ATMs are readily available in Puerto Natales but non-existent in the park.
Visa & Entry Requirements
Chile has a relatively open visa policy. Many nationalities, including those from the US, Canada, EU countries, Australia, and New Zealand, can enter Chile as tourists for up to 90 days without a visa. Always check the latest requirements with the Chilean Ministry of Foreign Affairs or your country's embassy/consulate well before your trip. Torres del Paine Visa Guide
Emergency Numbers
- General Emergency (Ambulance, Fire, Police): 131, 132, 133
- CONAF (Park Rangers): Contact directly through refugios or park entrances.
It's advisable to have these numbers saved on your phone. In the park, your first point of contact for non-life-threatening issues will usually be refugio staff or park rangers.
Comparison: Refuge Stays vs. Camping
Deciding between refugios and camping is a key part of your self-guided W Trek budget and experience.
| Category | Refugio Stay | Camping | Winner |
|---|---|---|---|
| Accommodation Cost | High (USD 50-80 dorm bed) | Low (USD 15-25 site only) | Camping |
| Food Cost | High (USD 120-180 full board) | Low (USD 10-20 self-catering) | Camping |
| Gear Weight | Minimal (sleeping bag/liner only) | High (tent, sleeping bag, pad, stove, food) | Refugio Stay |
| Comfort | Beds, heating, indoor facilities | Basic, exposed to elements | Refugio Stay |
| Booking Complexity | High demand, book far in advance | High demand, book far in advance | Tie |
| Social Aspect | Communal dining, shared dorms | More independent, quieter | Tie (preference-based) |
| Weather Protection | Guaranteed shelter from elements | Relies on tent quality, exposed | Refugio Stay |
| Showers/Toilets | Hot showers, flush toilets | Basic, shared facilities, cold showers | Refugio Stay |
Frequently Asked Questions (FAQs)
Is the W Trek difficult without a guide?
The W Trek is challenging due to its length (70-80 km over 4-5 days), elevation changes, and unpredictable weather, but it is not technically difficult. The trails are well-marked, and navigation is straightforward. The primary 'difficulty' without a guide comes from carrying all your own gear (if camping) and managing all logistics yourself. Prior multi-day hiking experience and good physical fitness are highly recommended.
How much does the W Trek cost self-guided?
A self-guided W Trek can cost anywhere from USD 300 (budget camping, self-catering) to USD 1500+ (refugio dorms with full board) for a 5-day/4-night trip, excluding international flights. Key cost factors include accommodation type, food choices, and gear rentals. Booking well in advance can help manage costs.
What permits do I need for the W Trek?
You need two main things: a CONAF park entrance ticket (purchased online via aspticket.cl) and confirmed bookings for all your overnight stays (refugios or campsites) through the respective operators, Fantastico Sur (fantasticosur.com) and Las Torres Patagonia (lastorres.com). There are no separate 'hiking permits' beyond these.
Can you visit Torres del Paine without renting a car?
Absolutely. The vast majority of W Trek hikers rely on public buses from Puerto Natales to the park entrances (Laguna Amarga or Pudeto). Within the park, you'll use park shuttles (from Laguna Amarga to Hotel Las Torres), the catamaran across Lago Pehoé, and your own two feet. A rental car is unnecessary and often impractical for the point-to-point nature of the W Trek.
Is it safe to hike the W Trek alone?
Hiking the W Trek alone is generally considered safe, particularly during peak season when trails are busy. The path is well-marked, and you'll encounter many other trekkers. However, solo hikers should be extra diligent with safety precautions: inform someone of your itinerary, carry a personal locator beacon (PLB) or satellite messenger, be prepared for all weather conditions, and be aware of your physical limits. Refugios offer a sense of community and support.
What is the best time to hike the W Trek?
The best time is typically during the Patagonian summer (December to February) for the warmest weather and longest daylight hours, though it's also the busiest. Shoulder seasons (October-November and March-April) offer fewer crowds and beautiful scenery (spring wildflowers or autumn foliage) but with more unpredictable weather and cooler temperatures. Each season has its trade-offs.
Article Methodology & Sources
This guide was meticulously researched using a combination of official government and park operator websites, reputable travel forums, and established trekking resources. Information on permits, bookings, and park regulations is directly sourced from:
- CONAF (Corporación Nacional Forestal): Official Chilean government entity managing national parks, including Torres del Paine. (e.g., aspticket.cl for park tickets).
- Fantastico Sur: One of the primary concessionaires for accommodation and services within Torres del Paine National Park. (fantasticosur.com).
- Las Torres Patagonia (formerly Vertice Patagonia): The other major concessionaire for accommodation and services. (lastorres.com).
- Hielos Patagónicos (Hip Sur): Operator of the catamaran service on Lago Pehoé. (hipsur.com).
- Local transport providers (e.g., Bus Sur, Buses Fernández, Buses Gómez) for bus schedules and pricing.
- General travel advisories and meteorological data for Patagonia from established weather services.
All price estimates are based on reported figures and market rates at the time of writing, acknowledging that prices in Patagonia can fluctuate and often increase annually. This guide aims to provide the most accurate and actionable information for independent trekkers.
Who Should Hike the W Trek Self-Guided?
The self-guided W Trek is ideal for experienced hikers who relish independence, are comfortable with planning their own logistics, and are physically prepared for the demands of multi-day trekking with their own gear. It offers a profound sense of accomplishment and a direct, unmediated connection with one of the world's most spectacular natural wonders. If you thrive on adventure and meticulous preparation, Patagonia awaits your independent spirit.
Related Guides
- Patagonia Packing List: What to Bring for Any Adventure
- The O Circuit: Torres del Paine's Ultimate Challenge
- Chile Visa Guide: Entry Requirements for International Travelers
- Puerto Natales: Gateway to Patagonia
- Argentina vs. Chile Patagonia: Choosing Your Adventure
- Solo Trekking in Patagonia: Safety and Tips
- Patagonia Wildlife Spotting Guide
- Understanding Patagonia Weather: A Trekkers' Forecast
- Torres del Paine Day Hikes: Beyond the W Trek
- Patagonia Food Guide: What to Eat on Your Trek
Editorial Methodology & Trust
Last Updated: July 2, 2026
Every Shaivio guide is created through editorial research using publicly available information from official tourism authorities, transportation providers, government resources, and other reliable references where applicable. Our editors review and update content regularly to improve accuracy and usefulness. Shaivio does not accept paid placements or sponsored rankings in editorial content. Because travel information can change, we recommend verifying critical details with the relevant official source before traveling.
