Sof Omar Caves

Longest cave in Ethiopia

Sof Omar Caves is the longest cave in Ethiopia at 15.1 kilometres (9.4 mi) long. When surveyed in 1972, it was the longest cave in Africa. Since then explorations in Madagascar (Marosakabe - 113km) and Algeria (Rhar Bou Ma’za - the Tafna River Cave 18.4 km) have overtaken it.

From Wikipedia, under CC BY-SA. More on occurri.