The Aberdares are an isolated volcanic range that forms the eastern wall of the rift valley, running roughly 100km north south between Nairobi and Thomsons Falls. The Aberdare National Park was formed in 1950 to protect the forested slopes and moors of the Aberdare Mountains. While the park has elephant, rhino, black leopard, lion and the beautiful but elusive bongo antelope, it is rarely visited by safari companies and individual travelers. Soils are volcanic origin and red. There are two main peaks Kinangop (3,906m) and Ol Donyo Lesatima (3,999m) separated by a lengthy saddle of alpine moorland at over 3,000m. The high rainfall turns the roads to mud and you need a 4×4 to get anywhere. The park often closes in the wet season. There are many clear streams and waterfalls.