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Roundtop Road is a hiking, biking, and horse trail in Los Angeles County, California. It is within San Gabriel Mountains National Monument. It is 2.7 miles long and begins at 6,231 feet altitude. Traveling the entire trail is 5.4 miles with a total elevation gain of 1,175 feet. The trail ends near Roundtop and Roundtop (elevation 6,260 feet).
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