The Tijuana River (Spanish: Río Tijuana) is an intermittent river, 120 mi (195 km) long, on the Pacific coast of northern Baja California in Mexico and southern California in the United States.
It drains an arid area along the U.S.–Mexico border, flowing through Mexico for most its course then crossing the border for its lower 5 mi (8 km) to empty into the ocean in an estuary on the southern edge of San Diego. Its lower reaches provide the last undeveloped coast wetlands in San Diego County amidst a highly urbanized environment at the southern city limits of Imperial Beach. The river has been the subject of great controversy in recent decades regarding pollution, flood control, and U.S. border protection.
It rises in the Sierra de Juárez of northern Baja California, approximately 45 mi (70 km) ENE of Ensenada. It flows WNW through Tijuana, crossing the border approximately 5 mi (8 km) from the Pacific. It flows west, just skirting the international border south of the San Ysidro section of San Diego. It enters the Pacific 10 mi (15 km) south of downtown San Diego at the southern city limits of Imperial Beach. The lower 2 mi (3 km) of the river form a broad mud flat estuary that is
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