Manoa Falls Trail passes through an arch grown from tree roots in Honolulu Watershed Forest Reserve, Oahu, Hawaii, USA. Walk 1.6 miles round trip with 800 feet gain to see Manoa Falls, a waterfall of Waihi stream in Manoa Valley. The 100-foot high Manoa Falls nestles in a lush tropical rainforest in Oahu's Koolau mountains.
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