Umphang Wildlife Sanctuary

Umphang Wildlife Sanctuary is a large protected forest area in Umphang District, Tak Province, western Thailand near the Myanmar border. Covering about 2,590 sq km, it is part of the Western Forest Complex and contiguous with Thungyai-Huai Kha Khaeng World Heritage Site. It is notable for its pristine evergreen and deciduous forests, high biodiversity, and for containing Thi Lo Su Waterfall, one of Thailand's largest waterfalls.

Visitors can expect a remote, heavily forested mountainous sanctuary with limited developed infrastructure. Access is primarily via rough roads and trekking trails. The main attraction is Thi Lo Su Waterfall inside the sanctuary, along with other waterfalls such as Thi Lo Cho, rivers for rafting, viewpoints, and dense forest habitats. Wildlife sightings are possible but not guaranteed. Visits typically require a local guide, 4WD vehicle, and advance permission, with camping or basic accommodation.

Established in 1989 as a wildlife sanctuary under the Department of National Parks, Wildlife and Plant Conservation. It forms a critical part of the Western Forest Complex, Thailand's largest intact forest landscape, and serves as a buffer and corridor for the Thungyai-Huai Kha Khaeng Wildlife Sanctuaries World Heritage Site.

The sanctuary area and surroundings are traditionally inhabited by Karen communities who have long lived in the forest margins. The forest is valued locally for watershed protection and as a natural heritage site representing western Thailand's forest ecosystem.