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River valleys of the United States (7 C, 30 P) W. Water gaps of the United States (4 C, 13 P) Wind gaps of the United States (2 C, 11 P)
Category: Valleys of the United States by state. 9 languages. ... Valleys of New York (state) (2 C, 16 P) Valleys of North Dakota (3 P) O. Valleys of Ohio (2 P)
Pages in category "River valleys of the United States" The following 30 pages are in this category, out of 30 total. This list may not reflect recent changes. A.
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Valleys of the United States (8 C, 7 P) Pages in category "Valleys of North America" The following 6 pages are in this category, out of 6 total.
Sacramento Valley; Saddleback Valley; Salinas Valley; Saline Valley; San Bernardino Valley; San Felipe Valley, California; San Fernando Valley; San Gabriel Valley; San Jacinto Valley; San Joaquin Valley; San Juan Valley; San Lorenzo Valley; San Ramon Valley; Sanel Valley; Santa Ana Canyon; Santa Ana Valley; Santa Clara River Valley; Santa Clara ...
In the United States, the EPA and the United States Geological Survey (USGS) are the principal federal agencies working with the CEC to define and map ecoregions. Ecoregions may be identified by similarities in geology , physiography , vegetation , climate , soils , land use , wildlife distributions, and hydrology .
A valley is an elongated low area often running between hills or mountains and typically containing a river or stream running from one end to the other. Most valleys are formed by erosion of the land surface by rivers or streams over a very long period. Some valleys are formed through erosion by glacial ice. These glaciers may remain present in ...