 Spanning of 160 km just north of Nairobi, the Aberdares provide invaluable services in support of the nation's economic development, human well-being and long-term environmental stability.In September 2011, Rhino Ark commissioned an independent study to assess the full impact of 20 years of conservation efforts in the Aberdares.The study's objectives were also to guide the future management of the Aberdare fence, as well as to provide an in-depth review of fencing as a tool to help sustainably manage a conservation area adjoining settlements, such as the Aberdare but als Mt.