[2] This recently (2013) described species[1] is endemic to Malaysian Borneo where it is known from its type locality in the Maliau Basin Conservation Area, Sandakan Division, Sabah as well as from the Batang Ai National Park, Sarawak.

The lower parts are immaculate yellowish orange, with chin mottled with small, back spots.

[3] The type series, a pair in amplexus, was collected at night when the frogs were perching on a tree branch that extended above the surface of a shallow pool at an elevation of 1,050 m (3,440 ft) above sea level.

[1] Frog species sharing the same habitat included Chiromantis inexpectatus,[4] Kurixalus appendiculatus, Polypedates macrotis, and Microhyla petrigena.

[4] Outside breeding season, Rhacophorus borneensis live high up in the canopy and are difficult to observe.