This is one of the earliest thematic maps of the world. The ocean currents are graphically depicted and although conjectural, the map is the first serious attempt to portray scientific phenomena based on the reported findings of seamen. Four curious tracks, perhaps denoting subterranean tunnels, link the Black and Caspian Seas, the Caspian Sea with the Persian Gulf, the Mediterranean with the Red Sea, and most interestingly the Atlantic with the Pacific through the Isthmus of Panama. The landmasses are marked with the locations of live volcanoes. Noted as scarce by Shirley.

References: Shirley #468; Robinson, p. 46-47.

Condition: B

Issued folding with several professionally repaired fold separations and moderate soiling at top only. There are additional professional repairs to several large worm holes along the center Meridian at top, a chip in top left blank margin, and a chip at top right entering 0.25" by 2.5" into map, with image skillfully replaced in facsimile.