Closed lakes in East Africa rose, sometimes by hundreds of metres. Lake Suguta developed in the Suguta Valley, accompanied by the formation of river deltas where rivers such as the Baragoi River entered the lake. In turn, Lake Suguta overflowed into the Kerio River, this adding water to Lake Turkana where increased discharge by the Turkwel River led to the formation of a large river delta. Lake Turkana itself overflowed on its northwestern side through the Lotikipi Swamp into the White Nile. Deposits from this lake highstand form the Galana Boi Formation. This overflowing large lake was filled with freshwater and was populated by humans; the societies there engaged in fishery but could probably also fall back on other resources in the region. Lake Zway and Lake Shala in Ethiopia joined with Lake Abiyata and Lake Langano to form a large waterbody which began overflowing into the Awash River. Other lakes that expanded include Lake Hayq also in Ethiopia, Lake Bogoria, Lake Naivasha and Lake Nakuru/Lake Elmenteita all in Kenya, and a lake formed in the caldera of the Menengai volcano. A large and deep Lake Magadi formed in the early Holocene, and in the Danakil Depression of Ethiopia freshwater conditions became established. Finally, lakes formed in depressions on the mountains around Lake Kivu.