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The 1.5 mile swim course begins at Alcatraz and finishes at the East Beach of Crissy Field located in the Golden Gate National Recreation Area's Presidio Park (zoom into the upper right hand corner of the map to find East Beach). Those going on to the run follow the Presidio's popular Golden Gate Promenade, a dirt trail that winds its way along the San Francisco Bay. After about 1.25 miles and once past the Warming Hut and the Torpedo Wharf, runners make a sharp left, veering away from the water and up a set of wooden steps, along a dirt trail, through a brick tunnel and up onto the east span of the Golden Gate Bridge (about 400 feet of elevation gain in less than a half-mile). Crossing to Vista Point at the north end of the bridge, runners turn around and retrace their steps to the finish line.