Amador Valley is a valley in eastern Alameda County, California, home to the cities of Dublin and Pleasanton and part of the larger Tri-Valley area. It is bounded by the foothills of the Diablo Range to the north and south, Pleasanton Ridge to the west and Livermore Valley to the east, and its watercourses, including South San Ramon Creek, Tassajara Creek, Arroyo Mocho, Arroyo Valle and Arroyo Las Positas, drain south through Arroyo de la Laguna to Alameda Creek and ultimately San Francisco Bay.
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