Banjermasin, city and port in Indonesia. Administrative center of the province of South Kalimantan. Population, 214,000 (1961). Bandjermasin is located on the broad delta of the Barito River, about 30 km from the coast of the Java Sea, on the swampy island of Tatas. The houses are mostly on stilts. Bandjermasin is a trade center. There is export of petroleum, lumber, rattan, pepper, rubber, guttapercha, and coal.