The Santa Rosa Valley is a small valley

Valley

In geology, a valley or dale is a depression with predominant extent in one direction. A very deep river valley may be called a canyon or gorge.The terms U-shaped and V-shaped are descriptive terms of geography to characterize the form of valleys...

 in Ventura County, California

California

California is a state located on the West Coast of the United States. It is by far the most populous U.S. state, and the third-largest by land area...

 about 5 miles (8 km) long (east to west) and 2 miles (3.2 km) wide (north to south) containing the rural community of Santa Rosa, which is sometimes considered to an outlying neighborhood of Camarillo

Camarillo, California

Camarillo is a city in Ventura County, California, United States. The population was 65,201 at the 2010 census, up from 57,084 at the 2000 census. The Ventura Freeway Camarillo is a city in Ventura County, California, United States. The population was 65,201 at the 2010 census, up from 57,084 at...

, although not within its territorial limits. It is bordered on the south by the Camarillo Hills and on the north by Las Posas Hills. The valley is drained principally by the Arroyo Santa Rosa, a tributary of Callegas Creek, which flows into the Pacific Ocean

Pacific Ocean

The Pacific Ocean is the largest of the Earth's oceanic divisions. It extends from the Arctic in the north to the Southern Ocean in the south, bounded by Asia and Australia in the west, and the Americas in the east.At 165.2 million square kilometres in area, this largest division of the World...

 at Magu Lagoon.