Kiambu, a Central Province district, has seven divisions: Lari, Kikuyu, Limuru, Kiambaa, Githunguri, Ndieya and Karai. The district covers an area of 1,324 km2 with 90% being high agricultural potential land. Rainfall is reliable and ranges from 1,500mm in the highlands to 500mm in the semi-arid areas of Ndeiya and Karai. These two divisions are vulnerable to drought.

Kiambu has three broad categories of soils namely high level uplands soils, soils on the volcanic foot ridges and plutonic soils. These Nitisols and Andosols are generally well-developed, well-drained, deep, high in fertility and are suitable for cultivation of various crops. However, repeated and high intensive use has led to depletion of soil nutrients. The plutonic soils found in the semi-arid areas of the district are either sandy or clay soils that are poorly drained but have potential for ranching and cultivation of drought resistant varieties.  Full report

 

Nyandarua, with area coverage of 3,304 km2, is the largest district in Central Province. It comprises of six administrative divisions namely, Ndaragwa, North Kinangop, Ol Kalou, South Kinangop, Ol Joro Orok and Kipipiri. 

The district has three main topographical features: the Kinangop plateaus and Ol Kalou/Ol Joro Orok salient, which lie between the Rift Valley and the Aberdare Ranges; the Dundori hills, on the west of the district, that form the block wall of the Great Rift Valley with gentle slopes; and the Aberdare Ranges where altitude rises from 3,999m and drops in a series of fault escarpments westwards to 1,828m on the floor of the Rift Valley, around Naivasha.