Carte de la Louisiane et du cours du Mississipi.

First issue, first state (New Orleans not yet located) of “the first detailed map of the Gulf region and the Mississippi, [and] the first printed map to show Texas”(Tooley, French Mapping of the Americas #43). This map is also known for its detailed depiction of the states adjacent to the Gulf of Mexico region, the Mississippi River and the land routes of many of the explorers of previous centuries.
On the map, De L'Isle made assertions that Carolina was a possession of the French. Shows Indian villages, "nations derangees, nations detruites," the route of de Soto, Moscoso, Cavelier, Tonty and Denis, etc. Relief shown pictorially.
Inset map: Carte particuliere des embouchures de la Rivie. S. Louis et de la Mobile, i.e., Mississippi Delta area and Mobile Bay.

Kohl 238: “This map is the mother and main source of all the later maps of the Mississippi.” Lemmon, et al, Charting Louisiana, Plate 18, p. 58: “Guillaume de L’Isle’s 1718 map is politically, geographically, and historically one of the most important maps of the Mississippi Valley. Repeatedly copied and widely referenced, it was the chief authority for the Mississippi river for more than fifty years.” Lowery 288: “Earliest map by Delisle showing De Soto’s route.” Luebke, Mapping the North American Plains, p. 10 (Ehrenberg): “Carte de la Louisiane et du Cours du Missisipi included a more accurate rendition of the lower Missouri and the Osage rivers, the introduction of the Kansas and Platte rivers, and the extension of an elongated Red River.... In addition the French belief that one could reach New Spain by traveling up the Missouri...was supported by the Delisles, who depicted the headwaters of the Missouri in close proximity to those of the Rio Grande and a chain of mountains paralleling the Rio Grande.”

See also Andrew M. Balash, “How Maps Tell the Truth by Lying: An Analysis of Delisle’s 1718 Carte de la Louisiane” (University of Texas at Arlington, December 2008)
"Maps do more than simply record geographical locations. Maps graphically display information that is at once geographic, economic, political, social, scientific, and religious. Through careful analysis, including the conscious and subconscious selections of map-makers, maps reveal a perception of the world.
This is the subjective vision of the world buried beneath the seemingly ‘objective’ façade of the map—the hidden story that the cartographers did not even know they were telling. Such an analysis applied to Guillaume Delisle’s 1718 "Carte de la Louisiane et du Cours du Mississipi", which not only reveals the state of French geographic knowledge about the North American continent, but also reflects political, social, and economic aspirations as well as a culture in transition from a Catholicized classical Greek view of the world and humans’ place in it to a view of the world through the emerging eyes of science in the service of the state."

Reference: Cumming, 170., Tooley, Mapping of America, 43., Wheat, 99., Paullin and Wright, 24; Martin, 19, etc.