Ol Donyo Sabuk National Park

Small park dominated by a mountain peak east of Nairobi, featuring buffalo, birds and scenic walking trails

Ol Donyo Sabuk (in Maasai), or Kyanzavi in Kamba, is a mountain in Kwanzaa Division, Machako's County, William Northrup McMillan was the first non native to settle here.

The peak has a height 2,145 metres (7,037 ft) and was named by Maasai pastoralists, meaning big mountain. The Kamba name, Kyanzavi means the mountain of nzavi or Lablab beans (Lablab purpureus). Kilimambogo, (another name of the mountain) has two parts, Kilima – meaning a hill or mountain in Swahili, and mbogo meaning a buffalo in many Bantu languages. The forested part of the mountain has a large population of buffaloes. Buffalo is called Nyati in Swahili.

The name of this park established in 1967, Ol Donyo Sabuk, means large mountain in Maasai. It is situated 65 km (40 mi) north of Nairobi and has an excellent and clear view of Nairobi and other lowland areas. Wildlife species that can be spotted here include buffalo, colobus monkeys, baboons, bushbuck, impala, duiker, and abundant birdlife.

Ol Donyo Sabuk National Park is a common one-day trip out of Nairobi, only 65 km (40 mi) away. The mountain is the highest peak in the park, covering 20.7 km2 (8.0 sq mi). It is particularly attractive for hikers or families wanting some freedom and exercise, outside their vehicles. One approach to the park is via the Fourteen Falls on the Athi River. The park's attraction is its beauty and views of both Mount Kenya and Mount Kilimanjaro. It teems with game, including baboon, colobus, bushbuck, impala, duiker and many birds. While the name "Ol Donyo Sabuk" is Maasai for 'large mountain', the word Sabuk was mistakenly thought by many writers to mean "buffalo", whereas in factthe Maasai call buffalo Olosowan. Today, some 250 buffalo roam the slopes. Kikuyu traditionalists also call the mountain by Kea-Njahe, known as the 'Mountain of the Big Rain', one of Ngai's lesser homes.

The solitary mountain rises to 2,145 m (7,037 ft) from an otherwise flat area. The steep ascent requires a 4WD (4×4) vehicle. Near the summit lie the graves of Sir William Northrup McMillan (1872–1925) and his wife, Lady Lucie.