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Region

• California (18,739)
• United States (418)
• California, Southern (160)
• California, Northern (86)
• Delta Region (Calif.) (36)
• Sierra Nevada (Calif. and Nev.) (30)
• Tahoe, Lake (Calif. and Nev.) (27)
• Mexico (26)
• Stringfellow Hazardous Waste Site (Calif.) (22)
• San Francisco-Oakland Bay Bridge (Oakland and San Francisco, Calif.) (18)
• Orange County (Calif.) (17)
• Los Angeles County (Calif.) (15)
• San Francisco Bay (Calif.) (15)
• West (U.S.) (15)
• Mexican-American Border Region (14)
• Pacific Area (14)
• Sacramento River (Calif.) (12)
• Tahoe, Lake, Region (Calif. and Nev.) (12)
• San Francisco Bay Area (Calif.) (11)
• Colorado River (Colo.-Mexico) (10)