Umphang Wildlife Sanctuary

Umphang Wildlife Sanctuary covers 2,516 square kilometres of the Tak highlands along the Myanmar border, one of the largest protected areas in the Western Forest Complex. It sits next to — but outside the formal boundary of — the Thung Yai Naresuan–Huai Kha Khaeng UNESCO World Heritage forest. Entry costs 200 THB for foreign visitors and 40 THB for Thai nationals, plus a 60 THB vehicle fee at the checkpoint, not the free entry some older listings still show.

The sanctuary’s main draw is Thi Lo Su, generally cited as Thailand’s largest waterfall — a multi-tiered limestone cascade reported at around 250 metres high and up to 450 metres across its widest tier, reached via a paved-then-unpaved road from Umphang town. Thi Lo Su Waterfall has its own detailed page; this one covers the sanctuary as a whole, which also protects two lesser-visited waterfalls inside its boundary: Namtok Ti Lo Cho, reached by a 40-minute bamboo-raft trip along the Mae Klong River, and Namtok Thi Lo Re, a multi-day rafting-and-trekking approach best suited to experienced visitors.

Sanctuary status here means something different from a national park. This is a เขตรักษาพันธุ์สัตว์ป่า — a “true” wildlife sanctuary under Thai law, set up primarily to protect habitat rather than host visitors, which is why access to Thi Lo Su is more tightly managed than typical national-park waterfalls elsewhere in Thailand. Day access by 4WD generally runs December to April; during the rainy season the vehicle track closes to let the forest recover, and reaching the falls then means either a guided raft-and-trek trip or written permission from sanctuary officials. Overnight camping near the falls also needs advance clearance.

Watch out: Officials require visitors to travel the final stretch to Thi Lo Su in a sanctuary-registered pick-up truck rather than a private car — factor the extra cost and coordination into your trip, and book it through an Umphang guesthouse or tour operator rather than expecting to self-drive all the way.

Wildlife here includes clouded leopards, Asian elephants, and several hornbill species, though sightings on a day trip are unlikely — this is dense, hilly evergreen forest, not a safari park. Trails and ranger stations are geared toward multi-day trekkers rather than casual visitors.

Insider Tip: Base yourself in Umphang town the night before — it is a 4-5 hour drive from Mae Sot, and starting the drive to the checkpoint before 7 AM beats both the afternoon heat and the queue of pick-up trucks at the ticket gate.