Gunung Tujuh
This mountain has a large lake, Danau Gunung Tujuh, which is the highest of its size in Southeast Asia. It has seven peaks (hence the name) of which only three have been climbed, according to Wikipedia, and are presumably the remains of an ancient crater rim. Apparently the highest peak has only even been climbed once due to its steepness, by an English photographer named Jeremy Holden.


