evidence: Geography - note landlocked; Lake Nyasa, some 580 km long, is the country's most prominent physical feature; it contains more fish species than any other lake on earth [...] Waterways 700 km(on Lake Nyasa [Lake Malawi] and Shire River) (2010) [...] Disputes - international dispute with Tanzania over the boundary in Lake Nyasa (Lake Malawi) and the meandering Songwe River; Malawi contends that the entire lake up to the Tanzanian shoreline is its territory, while Tanzania claims the border is in the center of the lake; the conflict was reignited in 2012 when Malawi awarded a license to a British company for oil exploration in the lake