Yuba City vs Valley

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Yuba City is a city in Northern California and the county seat of Sutter County, California, United States. The population was 64,925 at the 2010 census. Yuba City is the principal city of the Yuba City Metropolitan Statistical Area which encompasses all of Sutter County and Yuba County.

The metro area's population is 164,138. It is the 21st largest metropolitan area in California ranked behind Redding and Chico. Its metropolitan statistical area is part of the Greater Sacramento CSA.

Source: Wikipedia

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A valley is an elongated low area often running between hills or mountains which will typically contain 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 of time. Some valleys are formed through erosion by glacial ice. These glaciers may remain present in valleys in high mountain or polar areas. At lower latitudes and latitudes, these glacially-formed valleys may have been created or enlarged during ice ages but now be ice-free and occupied by streams or rivers.

In desert areas, valleys may be entirely dry or carry a watercourse only rarely. In areas of limestone bedrock, dry valleys may also result from drainage taking place underground rather than at the surface. Rift valleys arise principally from earth movements, rather than erosion. Many different types of valley are described by geographers, using terms that may be global in use or else applied only locally.

Source: Wikipedia