The Tijuana River Estuary is an intertidal coastal wetland in San Diego County, California, USA bordering Tijuana, Baja California. It is the location of the Tijuana River National Estuarine Research Reserve. The estuary is a shallow water habitat. Often termed an intermittent estuary since its volume is subject to the discharge controlled by the seasons of the year, the volume of the estuary fluctuates and at times there is dry land, or flooded areas.[1]
The estuary is one of the few remaining salt marshes on the South Coast. Its location positions it under the path of the Pacific Flyway, where it serves as a stopover point.[1] Many species of migratory and native species rely on the estuary as an essential breeding, feeding, and nesting habitat.[1] The estuary lies within the southernmost part of San Diego County within the city limits of the South Bay city of Imperial Beach and the wetland has last over 90% of its original habitat to development.[1]