Large format detailed map of North America showing California as an Island.
While the map shows a very large and very late example of an insular California, it is equally if not more fascinating for its marvelous treatment of the Mississippi Valley, Great Lakes and Transmississippi West treatment. The mapping of the Mississippi and its tributaries is extremely detailed and includes a number settlements. Nevertheless, it retains the exotic treatment of the source of the River as a series of Western Canadian Lakes, the last of which lists Indian Towns on its Islands. The treatment of the Red River and Missouri River are also unusual.