The lake-filled trough is the western arm of East Africa’s Rift Valley system, and this segment is named for …the lake in the upper right corner. These terrain systems are abrupt in their escarpments but subtle in their outer risings and in the long profiles of their highly various floors. There are also wonderfully unique ranges in the volcanic Virunga and the old-rock Ruwenzori. The curve of the valley arc is now punctuated by its amazing lakes. This elevation-only piece was a study for the more ambitious Escarpment piece.