A nice double hemisphere map showing California as an Island. In North America, both Baron Lahontan's fictitious R. Longue and a Str. of Annian indicate the possibility of a Northwest Passage. Northwestern North America and northeast Asia are left blank and unmapped. Above Japan, a partial coastline of the Land of Iesso is depicted. Australia's northern coast suggests a connection to New Guinea, and the coastlines for Tasmania and New Zealand are incomplete. Above the hemispheres is a north polar projection.