Located 80 kilometres north of Nairobi and 40 kilometres west of Thika town, Ndakaini Dam is famous to most of the people in Kenya. This fame is mostly attributed to the Ndakaini marathon races held in Kenya annually. The Ndakaini dam is also referred to as Thika dam. Ndakaini dam was set up in 1988 so as to supply water to the Nairobi City residents. A piece of land, approximately 1200 acres was set for this dam construction in Kenya. The dam occupies 600 acres of land, when full. The rest of the land was used as a construction site and a quarry for extraction of stones to build Ndakaini dam.