Puʻukukui

Puʻu Kukui is a mountain peak in Hawaiʻi. It is the highest peak of Mauna Kahalawai. The 5,788-foot summit rises above the Puʻu Kukui Watershed Management Area, an 8,661-acre private nature preserve maintained by the Maui Land & Pineapple Company. The peak was formed by a volcano whose caldera eroded into what is now the Iao Valley.

Puʻu Kukui is one of the wettest spots on Earth and the third wettest in the state after Big Bog, Maui and Mount Waiʻaleʻale, receiving an average of 386.5 inches of rain a year. Rainwater unable to drain away flows into a bog. The soil is dense, deep, and acidic.Puʻu Kukui is home to many endemic plants, insects, and birds, including the greensword, a distinctive bog variety of ʻōhiʻa lehua and many lobelioid species. Due to the mountain peak's extreme climate and peat soil, many species, such as the ʻōhiʻa, are represented as dwarfs. Access to the area is restricted to researchers and conservationists.