This hilly terrain is part of a massive debris-avalanche deposit that formed as a result of collapse of Gunung Gadung on the west side of Raung volcano. The debris-avalanche deposit has an estimated volume of about 25 km³. The avalanche banked against the slopes of Iyang-Argapura volcano and was deflected to the SW, traveling nearly to the Indian Ocean.

Photo by Lee Siebert, 1995 (Smithsonian Institution).

This image is made available under the Public Domain Dedication CC0 license, but proper attribution is appreciated.

Keywords: debris avalanche deposit | hummock

Raung