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A mention of the Diablo Range in the Tri-Valley is likely to draw the response: ‘What range? Do you mean Mount Diablo?’ The range runs from the Carquinez Strait south through 12 counties for a total of 150 miles to the Antelope Valley.

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CalMatters is a Sacramento-based nonpartisan, nonprofit journalism venture committed to explaining how California's state Capitol works and why it matters. It works with more than 130 media partners throughout the state that have long, deep relationships with their local audiences, including Embarcadero Media.