Stops on the Virtual Merapi Tour

Seven lahar dams have been built on the Boyong River by the Indonesian Department of Public Works with assistance from the Japanese government. The dams slow down the lahars, remove much of the debris they carry, and reduce the energy of the lahars. The dam is 10.5 m high and can capture 380,000 cubic meters of lahar material.

Older (ca. 15th century) lahar deposits are exposed in road cuts adjacent to the dam.