The Cassini Map refers to a series of detailed maps created by the French cartographer Jean-Baptiste Nicolas Denis d'Après de Mannevillette in the 18th century. These maps were significant for their accuracy and were among the first to use the Mercator projection, which allows for straight-line navigation. They played a crucial role in maritime navigation and exploration. The most famous of these maps is the Cassini Map of France, produced by the Cassini family, who were prominent in the field of cartography. This map provided a comprehensive view of France's geography, including its topography and administrative boundaries, and laid the groundwork for modern mapping techniques.