📝 Written 2 Jul 2026 · ✅ Fact-checked 3 Jul 2026 · prices and schedules can change — check with the operator before booking
If you ask Thai travelers to name a waterfall they want to see at least once in their life, Thi Lo Su almost always comes up near the top of the list. The waterfall sits inside Umphang Wildlife Sanctuary in Tak Province, a strictly protected forest with fragile wildlife and ecosystems. Unlike an ordinary waterfall, Thi Lo Su isn't somewhere you can just drive up to and walk straight in — it takes a long journey, a checkpoint, a permit application, and an officer or guide to lead you in. That's exactly what makes a Thi Lo Su trip feel like a full expedition rather than a quick stop on the way somewhere else.
Most popular trips are 2-3 day packages departing from Umphang or Mae Sot, combining rafting on the Mae Klong River, a jungle trek to the falls, and an overnight stay at a resort or riverside camp. This page tells the story straight — both the parts that make people fall in love with the trip and the parts you should brace for — with a strong emphasis on visiting respectfully within the rules of a wildlife sanctuary.
Thi Lo Su Waterfall Trip, Umphang (Rafting + Trekking + 2-3 Day Overnight)
Most Thi Lo Su trips start from accommodation in Umphang District or from Mae Sot, with a drive to the rafting put-in point on the Mae Klong River. In the rainy season, when water levels are high, you'll raft on an inflatable boat through rapids and small waterfalls along the way, such as Thi Lo Jo, before stepping ashore and trekking onward into Thi Lo Su Waterfall itself along a trail inside the wildlife sanctuary. The walk isn't long, but it's a dirt forest path that can get slippery in the rainy season. Once you reach the viewpoint, what greets you is a massive, wide curtain of water pouring down a multi-tiered limestone cliff, spreading into countless large and small streams across the whole cliff face — which is exactly why so many people call it the most beautiful and widest waterfall in Thailand.
The real appeal of Thi Lo Su is the feeling of having truly reached deep forest, not a crowded tourist spot. Visitors consistently describe the waterfall's roar echoing through the forest's silence, the cool damp air, and an overnight stay in Umphang that reveals a sea of fog and a border-town way of life quite different from typical tourist towns. Most 2-3 day package tours bundle in transport, rafting, a guide, meals, and accommodation, so you don't have to sort out permits and routes yourself — which matters a great deal, since this is a wildlife sanctuary, not a park you can simply walk into on your own.
The part you need to be honest with yourself about is the long journey and the seriously winding road. The Mae Sot–Umphang route is known as the 'sky road,' with a total of more than 1,200 curves, climbing and descending for hours on end. If you're prone to motion sickness, it can be rough without preparation. Another thing to know: you must have a permit to enter the wildlife sanctuary and must go with an official or guide — you cannot enter alone — and there are seasonal opening and closing periods. The rainy season (roughly August through November) brings the most water and the best rafting conditions, but trails get slippery and the route can close temporarily in some years during heavy rain. In the dry season, water levels drop and you'll often ride in by vehicle instead of rafting. Accommodation in Umphang consists of simple resorts and camps, not luxury hotels, and phone signal is weak or absent in some spots. Most important of all: this is a wildlife sanctuary — you must carry out all your trash, not take anything from the forest, avoid loud noise that disturbs wildlife, and stick only to the trails designated by staff.
- Thailand's widest waterfall — a massive curtain of water deep in the forest, as beautiful as the journey suggests, according to consistent visitor accounts
- A full, well-rounded experience: Mae Klong River rafting, jungle trekking, and an overnight stay deep in the Umphang forest
- Tour packages bundle transport, rafting, guide, meals, accommodation, and handle the permit paperwork for you
- A quiet, protected-forest atmosphere with a sea of fog and border-town life, distinct from typical tourist towns
- A long journey on the Mae Sot–Umphang road with more than 1,200 curves, climbing and descending continuously — rough going if you're prone to motion sickness and don't prepare
- Requires a wildlife sanctuary entry permit and an official/guide escort — you cannot enter alone, and there are seasonal opening and closing periods
- Accommodation in Umphang is simple, not luxury; signal is weak in some spots; and in the rainy season trails get slippery with a chance of temporary closures during heavy rain
💡 Know before you go: Thi Lo Su Waterfall, Umphang
August through November is the high-water season, when Thi Lo Su flows at its fullest and most beautiful, and it's also when Mae Klong River rafting is possible. But trails get slippery, and in some years the route closes temporarily during heavy rain. Check trail conditions with your tour operator before setting out.
Thi Lo Su sits within Umphang Wildlife Sanctuary, not an ordinary national park. You must apply for an area entry permit and go with an official or guide leading the way — you cannot enter alone. Booking a tour that arranges the permit for you is the easiest and most compliant option.
The Mae Sot–Umphang route has a total of more than 1,200 curves, climbing and descending continuously for hours. If you're prone to motion sickness, take medication about half an hour before departure, sit near the front, look toward the horizon, and keep a bag handy just in case.
Umphang is a small district with limited accommodation and tour availability. During the high-water season and long holidays, slots fill up fast. Book your tour and accommodation in advance to lock in a spot, get a clear price, and give the operator time to arrange the permit and guide.
Book Thi Lo Su tours and nearby Umphang-Tak activities
Compare schedules and prices across operators — booking online ahead of time means better availability, since Umphang tours are limited and require permit arrangements.
Visiting Thi Lo Su — where should you stay?
Most Thi Lo Su tours overnight in Umphang, but many travelers choose to stay one night in Tak town or Mae Sot before heading into Umphang. Compare prices across 3 sites before booking — booking ahead gets you better room availability and rates.
Search hotels on AgodaVisited Thi Lo Su and want a good location to stay in Tak, Mae Sot, or Umphang? See our handpicked accommodation.
See Top 10 Tak Hotels →