Ahihi Kina'u Reserve

Established in 1973, ʻĀhihi-Kīnaʻu Natural Area Reserve includes a coastal lava field and surrounding waters on the southwest coast of the island of Maui, Hawaii. It consists of 1,238 acres on land and 807 acres of ocean along 3 miles of Maui's southwestern coastline. The reserve includes several popular snorkeling/diving sites and many cultural and geologic sites as well as habitat for numerous rare and endangered species. The purpose and intent of the Reserve is to preserve and protect three unique components: the geologic setting of the most recent lava flow on Maui; unique assemblages of nearshore coral reef ecosystems; and the anchialine ponds found there.The reserve is located at the end of Mākena Road, south of Makena State Park and north of La Perouse Bay at 20°36′18″N 156°26′7″W.

Source: Wikipedia