This species is found in Sumatra (Indonesia) (southeast of Lake Toba and the Singkil River), Peninsular Malaysia (from the Mudah and Thepha Rivers in the north to the Perak and Kelanton Rivers in the south) and south Thailand (near the Malaysian border, east of the Thepha River watershed (Gittins 1978; Groves 2001; Marshall and Sugardjito 1986; W. Brockelman pers. comm.).