The OlDonyo Orok Mountain Forest Reserve is a government gazetted area, 117.84 square kilometres large.

Being one of the few remaining patches in Kenya, it contains a large variety of plants, herbs and also several animal species not found in the surrounding semi-arid lowlands.

Other large animals include buffaloes (in rapidly decreasing number due to poaching), bushbucks, olive baboons, vervet monkeys, rock hyraxes, etc.

The bush savanna vegetation in the surrounding lowlands is also home to animals like giraffes, zebras, gazelles, eland antelopes, warthogs, ostriches, african wild dogs and hyenas, etc.

The mountain receives few tourists annually, even though it lies next to Namanga, the gateway to Tanzania and Amboseli National Park.