evidence: Lake Malawi, aka Lake Nyasa, is the southernmost lake of the Great Rift Valley in East Africa. It fills a chasm in the Earth’s crust, at the edges of which are now the states of Malawi, Mozambique and Tanzania. [...] Lake Nyasa straddles the borders of three African countries: Malawi, Mozambique and Tanzania. The northern part of the lake is a territory of conflict: the dispute over the distribution of lake waters between Malawi and Tanzania is still unresolved. [...] Lake Nyasa is the first in the world in terms of diversity of fish stocks: up to 1000 species of fish live here. The overwhelming majority – up to 90% are cichlids: fish from the perch group. Predatory species stay away from the shore, in deep water; others live in the coastal zone. Here they are numerous, and a large part of them are endemics.