The Waitakere River is a river of the Auckland Region of New Zealand's North Island. It flows north then west from its sources in the Waitākere Ranges, reaching the Tasman Sea at Te Henga (Bethells Beach), to the south of Muriwai Beach. The upper reaches of the river are dammed to form the Waitākere Reservoir. The Waitakere Falls, just below the dam, are high and the third highest waterfall in the North Island.