Pu’u O Umi Natural Area Reserve

Pu’u O Umi Natural Area Reserve encompasses over 3,000 acres on the western slopes of Mauna Loa volcano on the Big Island of Hawaii. The reserve protects one of the last intact dry forest ecosystems in Hawaii, featuring endemic species such as the Hawaii ‘amakihi and ‘ioa birds, along with rare native plants like ‘a‘ali‘i and lama trees. The landscape is marked by expansive lava fields created from historic eruptions combined with native forests and shrublands on the steep volcanic slopes. The area carries cultural importance as ancient Hawaiians used parts of the landscape for sacred ceremonies and subsistence activities. Visitors to Pu’u O Umi find opportunities for solitude and exploration on rugged trails that traverse lava flows and native forest patches, highlighting the island’s volcanic origin and fragile ecology. The reserve is relatively remote with limited facilities, making it appealing to experienced hikers and naturalists seeking off-the-beaten-path experiences. Birdwatching is a popular activity due to the presence of endangered forest birds. The reserve also serves as a vital refuge for native biodiversity under pressure from invasive species and development. Pu’u O Umi’s quiet beauty and ecological significance offer a unique outdoor experience where visitors can observe both geological forces shaping the island and the resilience of native Hawaiian ecosystems.