| The San Diego region forms the southwest corner of California and occupies
approximately 3,900 square miles of surface area. The western boundary of
the Region consists of the Pacific Ocean coastline, which extends approximately
85 miles north from the United States and Mexico border. The northern boundary
of the Region is formed by the hydrologic divide starting near Laguna Beach
and extending inland through El Toro and easterly along the ridge of the
Elsinore Mountains into the Cleveland National Forest. The eastern boundary
of the Region is formed by the Laguna Mountains and other lesser known mountains
located in the Cleveland National Forest. The southern boundary of the Region
is formed by the United States and Mexico border. For additional information
try the EPA - WATERS EnviroMapper.
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