Unrecorded variant of Baron de Lahontan's imaginary west-east Long River (Riviere Longue), rising in distant western mountains and emptying into the upper Mississippi. The map extends east to the Great Lakes to show Lac Superieur, and Lac de Illinois (Michigan), along with a number of the early French forts and fur trading outposts. Extensive annotations and diagrams throughout. Lahontan's map was one of the most influential of all mythical cartographic works, effecting the cartographic landscape of the upper Mississippi/Plains Region for nearly 50 years. Issued in Noueaux Voyages de M. le Baron de Lahontan dans l'Amerique Septentrionale, one of the most influential and fanciful Longue flowing from the mountains in the west (Rocky Mountains), home to the Gnacsitares Indians, and connecting to the Mississippi River. On the western side of the mountains is another river, presumably flowing into the Pacific. Lahontan's concept was copied by virtually all 18th-century cartographers, including Moll, Senex, Popple, and Delisle, thus perpetuating the myth. This edition not in Kershaw.
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