evidence: Lake Malawi, also known as Lake Nyasa in Tanzania and Lago Niassa in Mozambique, (Swahili: Ziwa Nyasa) is an African Great Lake and the southernmost lake in the East African Rift system, located between Malawi, Mozambique and Tanzania. [...] Borders [edit]Tanzania–Malawi dispute [edit]The partition of the lake's surface area between Malawi and Tanzania is under dispute. Tanzania claims that the international border runs through the middle of the lake.[30] On the other hand, Malawi claims the whole of the surface of this lake that is not in Mozambique, including the waters that are next to the shoreline of Tanzania.[31] Both sides cite the Heligoland Treaty of 1890 between Great Britain and Germany concerning the border. The wrangle in this dispute occurred when the British colonial government, just after they had captured Tanganyika from Germany, placed all of the waters of the lake under a single jurisdiction, that of the territory of Nyasaland, without a separate administration for the Tanganyikan portion of the surface. Later in colonial times, two jurisdictions were established.[32] [...] - ^ a b c d "Lake Nyasa". Columbia Encyclopedia Online. Columbia University Press. Retrieved 2011-08-02.