The tallest mountain in Orange County, top height of 5,700 ft / 1735 m. One of the main roads to the top is Main Divide Road starting in Corona and is 22 miles of a narrow, windy, dirt to the top. The long trip offers amazing views from the top on a clear day, all the way past Catalina Island off the coast. Another fun location, Beeks Place, is on the way up.