The Cherangany Hills rise gently to form the western half of the Great Rift Valley and extend northwest in a broken chain to Mount Moroto in Uganda.

[5] Non-volcanic in origin, the Cherangany Hills resulted from subsequent erosion of the raised western ridge of the Eastern Rift Valley.

It is made up of the sub-dialects Almoo, Endoow, Markweta (the sub-dialect giving rise to the common name), and Sombirir (Borokot) who presently predominantly live in Marakwet District in the North Rift Valley Province.

The latter name is disputed as a corruption of the true name, which was coined by the Uasin-Gishu Maasai, who were the Keiyo's neighbours in the mid-9th century at the western side of Eldoret.

[8] Elgeyo - Marakwet is divided into 4 sub-counties, 20 county assemblies wards, 68 locations and 199 sub-locations.

Source[9] Wisley Rotich who succeeded Alex Tolgos is currently serving his first term as the county's Governor.

[10] William Kisang is the current senator replacing Kipchumba Murkomen who was appointed as Cabinet Secretary for Roads.

Other activities include small business, tourism and fluorspar mining in Kerio Valley.