Briones Valley
Encyclopedia
The Briones Valley is a major geological feature of Contra Costa County, California
Contra Costa County, California
Contra Costa County is a primarily suburban county in the San Francisco Bay Area of the U.S. state of California. As of the 2010 census, it had a population of 1,049,025...

 and runs between Mount Diablo and the county seat of Martinez
Martinez, California
Martinez is a city and the county seat of Contra Costa County, California, United States. The population was 35,824 at the 2010 census. The downtown is notable for its large number of preserved old buildings...

. Also it is the seat of many riparian watersheds, especially of Alhambra Creek
Alhambra Creek
Alhambra Creek is a stream in Contra Costa County, California in Northern California which drains into the Carquinez Strait by way of the historical Arroyo del Hambre. Alhambra Creek and its valley take their name from Cañada del Hambre, Spanish for "valley of hunger", apparently because of some...

.

37.9138134°N 122.2083007°W
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