evidence: Tanzania is embroiled in a territorial wrangle with Malawi over the ownership of Lake Nyasa, which is known as Lake Malawi in the neighboring country. Malawi, which sits to the west of Africa's third-largest lake, claims the entire northern half of the lake while Tanzania, to the east, says it owns half of the northern area. The southern half is shared between Malawi and Mozambique. [...] In 2011, impoverished Malawi awarded exploration licenses to British-based Surestream Petroleum to search for oil in the lake.