Banjarmasin, also Bandjarmasin, city and port, Indonesia, on the southeastern part of the island of Borneo, capital of South Kalimantan Province, at the junction of the Barito and Martapura rivers, near the Java Sea. The port, reached by oceangoing vessels, is a shipping point for the products of the surrounding region, including pepper, rubber, timber, rattan, coal, iron, and diamonds. Many of the structures in the city are built on piles over the river or on floating rafts. Population (1997 estimate) 546,466.
