Castanopsis acuminatissima is an evergreen tree native to Southeast Asia and New Guinea.

[2] Castanopsis acuminatissima is a large canopy tree, up to 40 meters in height.

The bark is grey or pale brown, rough and fissured, less than 25 mm thick, with red under-bark.

[3] Castanopsis acuminatissima ranges from southwestern China (Guizhou and Yunnan provinces) through Indochina (Laos, Myanmar, Thailand, Vietnam, and the Chittagong Hills of Bangladesh) and Malesia (Malaysia; the islands of Sulawesi, Java, Kalimantan, and Sumatra, in Indonesia; the islands of New Guinea (West Papua in Indonesia and Papua New Guinea) and New Britain (Papua New Guinea).

[1] In New Guinea and New Britain, it is a predominant tree in the lower montane forests, lying between 900-1000 and 2000 meters elevation.