'Āhihi-Kīna'u Natural Area Reserve covers 826 ha (2,040 acres) in the south of Maui. The reserve was established in 1973 and boasts unique geological features, such as anchialine pools and kīpukas, 'islands' of land spared, but surrounded by lava flows. More lava can be seen in the form of lava tide pools, coastal lava tubes and aa, or rough, jagged lava.

The reserve has been designated a natural area reserve because of its distinctive marine life habitat.

The remains of an old coastal Hawaiian village sit between lava flows at 'Āhihi Bay. The site is marked by walled and terraced platforms.

Along the coast are numerous coral reef systems that are popular snorkeling/scuba-diving sites.

'Āhihi-Kīna'u Natural Area Reserve is about 175 km southeast of Honolulu, at then end of Mākena Road, south of Makena State Park and north of La Perouse Bay.