The Rimoi National Reserve is found in the Elgeyo Marakwet County covering an area of 66 square kilometers and it is managed by the Kenya Wildlife Service. It lies adjacent to Lake Kamnarock which has recently dried up and is part of a conservation area that is five larger than its size.
Traditionally the only large mammals in Rimoi and Kamnarok were elephants which wander in and out and up and down the valley at will in accordance with the availability of water and food.
The elephants feed mainly at night. Smaller mammals in the reserve include; the bush pigs, warthogs, dik-diks, impalas, monkeys, civets, genets, and pangolins. The reserve is also a home to various reptiles such as; crocodiles, tortoises, snakes, and numerous lizards including the Agamas.
The reserve is currently being fenced with a corridor being left for the elephants and also the Elgeyo Marakwet and Baringo Governors released thirty zebras into the reserve in 2016 as part of a plan by the Elgeyo Marakwet County Government to restock the reserve.
The reserve had been neglected for many years until April 2015 when the Elgeyo Marakwet County Government and the Kenya Wildlife Service collaborated in rehabilitating the reserve.