Upper Green Valley
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Upper Green Valley is a valley in the Cuyamaca Mountains in San Diego County, California. Its mouth lies at an elevation of 4,163 feet / 1,269 meters. Its head is at 32°59′03″N 116°32′01″W / 32.98417°N 116.53361°W, at an elevation of 4,890 feet.[1] The Sweetwater River has its source at the top of Upper Green Valley.[2]