Barito River
"N. bancanus" is found in southwestern Borneo, in the Indonesian provinces of West and South Kalimantan, as well as the island of Bangka. On Borneo, its range extends south of the Kapuas River and east towards—but not reaching—the Barito River. The Bangka population is allopatric with the other Bornean species, but the population on Borneo may exhibit some sympatry with "N. borneanus" in the province of West Kalimantan.