The Pomona Valley is located on the far eastern edge of Los Angeles County -- actually straddling it and San Bernadino County. The towns of Chino, Chino Hills, Montclair, Ontario, Rancho Cucamonga, San Antonio Heights, and Upland -- all geographically in the Pomona Valley -- are all located across the San Antonio River, on the … Continue reading California Fool’s Gold — A Pomona Valley Primer