The Great Basin
This map encompasses the mountain West’s very large
territory of internal drainage, where rivers flow into dry or saline lakes
rather than the ocean. It includes most of Nevada and Western Utah, as well as
large parts of California and Oregon, and small corners of Wyoming and Baja
California. Arizona is also shown on the map.
Small - Scale is 1:2 million or 1" = about 32 miles
Large - Scale is 1:1.5 million or 1" = about 24 miles
