Beautiful, large-scale map of Senegal and surrounding areas. Guillaume de l’Isle, widely regarded as the first truly scientific cartographer, carefully attempted to reconcile conflicting geographic information, and rejected any information not supported by adequate evidence. Even de l’Isle, however, was limited by the geographic knowledge of his time. The course of the Niger was not yet determined, and here de l’Isle conflates it with the Senegal River. Further south, the source of the Gambia River is shown as the nonexistent Lac de Sapert. On the edge of the map, we see the fabled city of Timbuktu, below its actual location, but at a remarkably accurate longitude. In several places, the cartographic information is enhanced with geographical and political commentary. The map’s title cartouche indicates that it was published posthumously, by the author’s widow.