The most accurate map of North America to date, including much original western information not found on any other printed map. Recent Spanish, French and English discoveries in the West and North-West are shown, with numerous historical and geographical notes including speculation as to the source of the Missouri River. A large ‘West Sea’ is placed in the northwest. The map depicts a radically different, and more informative cartography than the current French (i.e. Danville) cartography west of the Mississippi. Pikes Lake (unnamed) and Manton’s River in the north west are precursors of the ‘River of the West’ which would extend westwards out of the lake. These first two features appear to have been first seen on Nicolas Bellin’s map of North America, 1755, following the manuscript of Verendrye. It is believed this is their first use on an English map. Its cartography differs in the west from the Mitchell map of 1755, particularly in the Upper Mississippi River depiction. The source of the Rio Grande is marked as unknown. The map is very scarce. Separately published maps of this size and date rarely survive and are usually found in good to poor condition. Sellers & van Ee, Maps and Charts, no. 88; Phillips p. 579; Streeter sale 3911; Walker, James, ‘Jonathan Carver …’ in Mercator’s World vol. 1 no. 5 pp. 30-7.