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The Great Basin (Spanish: Gran Cuenca) is the largest area of contiguous endorheic watersheds, those with no outlets to the ocean, in North America.It spans nearly all of Nevada, much of Utah, and portions of California, Idaho, Oregon, Wyoming, and Baja California.
Northern California usually refers to the state's northernmost 48 counties. The main population centers of Northern California include San Francisco Bay Area (which includes the cities of San Francisco, Oakland, and the largest city of the region, San Jose), and Sacramento (the state capital) as well as its metropolitan area.
Coastal California is heavily influenced by east–west distances to the dominant cold California Current as well as microclimates.Due to hills and coast ranges having strong meteorological effects, summer and winter temperatures (other than occasional heat waves) are heavily moderated by ocean currents and fog with strong seasonal lags compared to interior valleys as little as 10 mi (16 km) away.
The Pacific Basin is bounded by the Continental divide to the east and Pacific Ocean to the west; the basin excludes the endorheic Great Basin in the west. The Great Basin has a closed loop boundary encompassing substantially all of Nevada, the western half of Utah and parts of Oregon, California, Idaho, and Wyoming.
The Northern Coast Ranges run north–south parallel to the coast. Component ranges within the Northern Coast Ranges include the Mendocino Range of western Mendocino County and the Mayacamas, Sonoma, and Vaca Mountains and the Marin Hills of the North Bay. They also include the King Range, which meet the sea in the "Lost Coast" region.
Here are maps showing some of Northern California’s most populated areas within a tsunami hazard zone, as determined by the California Geological Survey. The yellow section indicates the tsunami ...
California region, with its 10 4-digit subregion hydrologic unit boundaries. The California water resource region is one of 21 major geographic areas, or regions, in the first level of classification used by the United States Geological Survey in the United States hydrologic unit system, which is used to divide and sub-divide the United States into successively smaller hydrologic units.
Map of the Tulare Lake Basin. Usually an endorheic basin, waters in this region all eventually would reach Tulare Lake. This region would overflow into the San Joaquin River during flood years when Tulare Lake overflowed. Streams are listed clockwise around the Tulare Basin, starting at the Kings River: Kings River (jump to tributaries) Sand Creek