sentences:  The Portuguese were also told that the Mozambican Espirito Santo "river" (actually an estuary formed by the Umbeluzi, Matola and Tembe rivers) was sourced from a lake (hence its outlet became known as Delagoa Bay).As a result, several old maps depict the Zambezi and the "Espirito Santo" rivers converging deep in the interior, at the same lake.However, the Bisa-derived etymology is not without dispute.