Santa Ana River

The Santa Ana River is a major river in southern California, in the United States. It begins in San Bernardino County and flows west about  to the Pacific Ocean, through Riverside and Orange counties. It has a watershed of 2,650 square miles (6,863 square kilometers). Its biggest tributaries include Lytle, Temescal, and Santiago Creeks. Like the Los Angeles and San Gabriel rivers to the north, it is lined with concrete in many places. A notable feature on the river is the Seven Oaks Dam, which, at  tall, is the 6th tallest dam in the United States.

Nearby rivers
North along coast
San Gabriel River

South along coast
San Diego Creek

References
Santa Ana River Watershed 
OC Watershed 

Category:Rivers of Los Angeles County, California
Category:Geography of San Bernardino County, California
Category:Geography of Riverside County, California
Category:Orange County, California