California’s Central Valley is a large, flat valley that dominates the central portion of California. The valley stretches approximately 450 miles (720 km) from northwest to southeast inland and parallel to the Pacific Ocean coast.
The ‘Central Valley Grassland’ is the Nearctic temperate and subtropical grasslands, savannas, and shrublands ecoregion which was once a diverse grassland containing areas of desert grassland (at the southern end), prairie, savanna, riverside woodland, marsh, several types of seasonal vernal pool and large lakes.
However much of the Central Valley environment has been removed or altered by human activity including the introduction of exotic plants, especially grasses. It is home to California’s most productive agricultural areas. The wetlands have been the target of rescue operations to restore areas nearly destroyed by agriculture