The Rio Hondo (Spanish for "deep river") is a river in Los Angeles County, California. Its official beginning is at a reservoir called the Whittier Narrows Reservoir; and it flows southwest to the Los Angeles River. Notably, the Whittier Narrows Reservoir is also fed by the San Gabriel River, and water can be released into either river. Therefore, the watersheds of the Los Angeles River and San Gabriel River are connected by the Rio Hondo. 