The Hawai`i Institute of Marine Biology (HIMB) is a marine biology laboratory located on the state-owned Coconut Island in Kāne'ohe Bay. Coconut Island is approximately 29 acres (120,000 m2), including 6 acres (24,000 m2) of enclosed lagoons used to keep organisms being studied in captivity. Surrounding it are 64 acres (260,000 m2) of coral reef, designated by the state of Hawai‘i as the Hawai‘i Marine Laboratory Refuge. It is part of the University of Hawaii at Manoa. It is the only research facility in the world built on a coral reef.