The park, home to mountains, waterfalls and caves, is part of the Western Forest Complex protected area.

Sai Yok National Park is in the Tenasserim Hills mountain chain, 100 kilometres (62 mi) northwest of Kanchanaburi town.

[3][4] Within the park are remains of a bridge on the Burma Railway and of a camp used by Japanese troops during World War II.

[6] Other tree species include Shorea obtusa, Xylia xylocarpa, Bambusa bambos, Walsura robusta and Dialium cochinchinense.

The bat was first spotted in 1973 and is found only in some limestone caves of the park (including Tham Kang Kao) and surrounding areas in Kanchanaburi Province and nearby Myanmar.