l'Hemisphere Septentrionale pour voir plus distinctement Les Terres Arctiques. . .

It covers from the North Pole south in all directions to include the Arctic Regions, all of North American, Central America, Asia, and Europe with parts of South America and most of Africa.
On either side of the map proper there is text (in French on the left side and in Dutch on the right side) in the form of a letter written by Monsieur Swartz, a Danish explorer in the service of the Czar, concerning his explorations near Japan and Kamchatka.
Covens and Mortier's more interesting updates over the earlier de L'Isle version of this map primarily relate to explorations in North America and in East Asia. North America is drawn as it appeared at the height of the Colonial period. English colonies hug the eastern coast, while the French control the Great Lakes regions and the swathe of 'Louisiana'. The Spanish control Mexico, California and the Southwest.
California is shown connected to the mainland with a dotted line - indicating that European map publishers were not yet convinced to give up entirely on the idea that California may indeed be an Island. 

The map names the city of Quivara, which is one of the lands associated with Spanish legends of the 'Seven Cities of Gold'. It also highlights the Sioux and the Apalache people via place names. As befits de L'Isle's scientific approach to cartographer much of the unexplored northwest of America remains vacant. By way of contrast, the northeast parts of Asia, which had recently been explored by Vitus Bering and Tschirikow, offer a number of interesting developments, the 'Land of Compagnie' is shown just to the east of Yedso (likely Hokkaido) with a note regarding its mysterious discovery by Jean de Gama. 

Often called de Gamma Land or Gama, this island was supposedly discovered in the 17th century by a mysterious figure known as Jean de Gama. Other subsequent navigators claim to have seen this land, but it was left to Bering to finally 'sink' the myth. In 1729, as he sailed for three days looking for Juan de Gama land but never found it.
Gama or de la Compagnie remained on maps for around 50 years following Bering's voyages, up until the explorations of James Cook confirmed Bering findings.
Japan itself is only vaguely mapped though Edo (Yendo) is indicated. Just to the west the Peninsula of Korea is drawn with a fairly accurate if slightly bulbous form. Further south Formosa and the Philippines are well mapped.
Published by Covens and Mortier in their reissue of Guillaume de L'Isle's' Atlas Nouveau'.