The small, circular light-green area just left of the river in this NASA Landsat image (with north to the top) is Musuan volcano. This andesitic-to-dacitic lava dome and tuff cone, also known as Calayo, rises more than 600 m above flat farmland in the province of Bukidnon in central Mindanao Island in the southern Philippines.

NASA Landsat 7 image (worldwind.arc.nasa.gov)

This image is made available as a Public Domain Work, but proper attribution is appreciated.

Musuan