 The cave is accessible via a hanging bridge from the Montalban gorge.The focal point of the protected area is the Wawa Dam, a decommissioned arch-gravity dam that is tall and long situated in this gorge portion of the Upper Marikina River.It was built in 1904 by the American colonial government and was the only source of water supply for Manila at the time until it was replaced by the Angat Dam in the 1960s.