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Sentinel Rock is within a region of Mount Diablo State Park called Rock City. (Obviously a rocky section of the park). Sentinel Rock formed out of sandstone and juts out the surrounding landscape to offer a good vista of the area. There is another, more well known, Sentinel Rock located in Yosemite Valley. (So don't confuse the two).
Mount Diablo is located in Northern California, about 25 miles from San Francisco. It is 3849 feet in height, and offers great views of the entire Bay area and San Joaquin valley.
Lat 37.851448 Lon. -121.935600
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