1. Kapuas riverbr br Kapuas River is the longest river in Indonesia. br br Located in the West Kalimantan Province, Kapuas River has a 1,143 km length. br br The headwaters of Kapuas is located in the Muller Mountains and ends in the Karimata Strait (South China Sea).br br The Kapuas River is the core to support the Dayak tribe's activities. See more in the video.