150 km north of Nairobi, Nyeri lies in the Central Highlands straddling two mountain massifs –the western slopes of Mount Kenya and the eastern base of the Aberdare (Nyandarua) Range which forms part of the eastern end of the Great Rift Valley.
The colonial town of Nyeri was the centre of the Happy Valley settlers, a group of British aristocrats and adventurers who became famous for their infamous decadent lifestyles and exploits during the 1930's and 40's.
The town retains little of an English village where the cool air and morning mists once attracted the Happy Valley settlers. The major industry in the county is farming due to its fertile soils. The area is one of the most densely populated.