Manoa Falls is a waterfall on the island of O'ahu in Hawai'i, featuring a vertical drop of about 150 feet (46 m). It is accessible from the nearest road by a hike of approximately 1.5 miles (2.4 km). The hike passes through many ecosystems and feels like an arboretum. At the bottom of the falls there is a tiny pool good for wading. The path is often slippery and muddy, and flash floods are prone to occur anytime.