This very uncommon map concentrates of the source of the Nile in a lake called "Tzana, Dembea", which Coronelli claimed to be the first to accurately depict. Extensive notations throughout. The map is graphically illustrated with large mountains, a large garland style title cartouche and scale of miles. Inset is a map of the origin of the Nile, on the Ptolemaic model, in two large lakes south of Abyssinia. Couple of small tears in margins, else fine.