They were formed at least 100 million years ago along a fault lying to the east of the East African Rift, which is a more recent structure. About 30 million years ago, all this area was covered by extensive rainforest.
These geological features appeared at least 100 million years ago near a fault to the east of the East African Rift, which is a more recent geological feature. About 30 million years ago, this area was covered by extensive rainforest.