De L'ISLE / BUACHE, Ph. - Mappemonde l'usage du Roy par Guillaume Delisle..

Curious late issue of De L'Isle's double hemisphere world map, first published in 1720 by De L'Isle and first revised by Buache in 1745. This map is most notable for it's depiction of Mer de L'Quest or Sea of the West. A great sea, easily the size of the Mediterranean, to flow from the then-known Strait of Juan de Fuca. He also shows an opening to the ocean from this great sea at roughly in North California or Oregon and Quivira somewhere in Idaho.
With the address of Ph.Buache, dated 1745. The map carries dates in its lower title cartouche up to 1754. Uncommon.
The map is a marvelous depiction of the routes of Captain James Cook on this 3 voyages between 1773 and 1779.
The map has been revised to show the United States (Etats Uis), a detailed post Vancouver treatment on Alaska and the Northwest Coast of America, a completed (but still conjectural) coastline of Australia, updated configuration for New Zelaland and evidence of early contacts with islands near the Antarctic Circle.
In the northern regions, the discoveries of MacKenzie are shown.

Philippe Buache was one of the most active proponents of the so-called school of theoretical cartography active in mid-18th century France.