Puu Nianiau Puʻu Nianiau is an ancient volcanic cone on the northwestern flank of Haleakalā on the island of Maui, Hawaiʻi. Rising to approximately 6,849 feet (2,088 meters), the modest summit sits near the entrance to the Summit District of Haleakalā National Park, not far from Hosmer Grove and the road that climbs toward the …
