Africa’s Great Rift Valley is a 6,000 mile crack in the earth’s crust, stretching from Lebanon to Mozambique. One of its most dramatic sections slices through east Africa dividing Kenya into 2 segments. Geologists know that Rift Valley was formed by violent subterranean forces that tore apart the earth’s crust. These factors caused huge chunks of the crust to sink between parallel fault lines forcing up molten rock in volcanic eruptions. Kenya’s Rift Valley has a geographic feature called bambos. These are shallow depressions located often near rivers filled with water during the rainy season. A dambo can be a kilometer in length and several hundreds of meters in width. Due to the frequent presence of water, tall papyrus and several other grasses grow around their edges. These dambos are breeding grounds for mosquitoes, even in the dry season as they remain greener than other areas.