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Regional Characteristics. The Central Valley, also known as the Great Valley of California, covers about 20,000 square miles and is one of the more notable structural depressions in the world. Occupying a central position in California, it is bounded by the Cascade Range to the north, the Sierra Nevada to the east, the Tehachapi Mountains to the south, and the Coast Ranges and San Francisco Bay to the west.
Relationship to other classification schemes. The Central Valley ecoregion was originally based on Omernikâs Central California Valley ecoregion (7), although boundaries in some areas have been revised by Bob Holland, an expert on vernal pools and valley vegetation.