Horsethief Canyon, is a canyon comprising the upper part of the Summit Valley in San Bernardino County, California. Its head lies at 34°19′33″N 117°25′38″W / 34.32583°N 117.42722°W at an elevation of 3,800 feet just east of the summit of Cajon Pass, and its mouth at an elevation of 3,123 feet / 952 meters. California State Routes 138 and 173 pass through it.
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