evidence: Lake Malawi is an African Great Lake, located on the Tanzania-Mozambique-Malawi border and known as Nyasa in Tanzania and Lago Niassa in Mozambique. Lake Malawi is Africa’s third-largest and the world’s ninth-largest lake by surface area, covering 29,600 sq. km. It is the world’s sixth-deepest and Africa’s second-deepest lake by maximum depth. However, it is the world’s fifth-largest freshwater lake by total volume. The lake has the highest fish species of any lake in the world. It is an example of a meromictic lake whose water layers do not intermix. [...] Lake Malawi lies on the Tanzania-Malawi-Mozambique border and has a shoreline on eastern Malawi, western Mozambique, and southern Tanzania. Parts of the Tanzania-Malawi and Malawi-Mozambique border and the tripoint is located in the lake. While Tanzania claims its boundary with Malawi lies in the middle of the lake, Malawi insists the whole of the lake’s portion not in Mozambique is part of its territory. The conflict resulted from the 1890 Heligoland Treaty between the British and Germans, with the British placing the waters of the entire lake in Nyasaland. The Malawi-Mozambique border, defined in 1954 by the Portuguese and British, is a line passing through the middle of the lake. This boundary is undisputed.