Tijuana River National Estuarine Research Reserve

Tijuana River National Estuarine Research Reserve is a natural reserve in Imperial Beach, California and San Ysidro, San Diego. It encompasses the Tijuana River Estuary, located on the Mexico–United States border. It is divided into two parts: the Tijuana Slough National Wildlife Refuge on the north, and Border Field State Park in the south.

It can be accessed from the Coronado Avenue exit from Interstate 5. It is established as part of the National Estuarine Research Reserve system in the United States and managed in part as a Biological Field Station by San Diego State University 's College of Sciences. The water flow of Tijuana River is often intense; droughts dry up the river completely while the same area overflows during flood.

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