The physiographic regions of the

contiguous United States The contiguous United States (officially the conterminous United States) consists of the 48 adjoining U.S. states and the Federal District of the United States of America. The term excludes the only two non-contiguous states, Alaska and Hawaii ...

comprise 8 regions, 25 provinces, and 85 sections. The system dates to Nevin Fenneman's paper ''Physiographic Subdivision of the United States'', published in 1917. Fenneman expanded and presented his system more fully in two books, ''Physiography of western United States'' (1931), and ''Physiography of eastern United States'' (1938). In these works Fenneman described 25 provinces and 85 sections of the United States physiography.

Physiographic divisions

References

{{DEFAULTSORT:United States Physiographic Region