Endemic to Indonesia, Sulawesi, South Sulawesi: Mt. Lompobatang massif (including Mt. Bawakaraeng), Mt. Bowonglangit and Tompobulu.
(Ardi, W.H. & Thomas, D.C. 2019. A new species of Begonia (Begoniaceae) from South Sulawesi, Indonesia, and an augmented description of Begonia bonthainensis in Reinwardtia 18(1): 19-26.)