Molokini is a crescent-shaped, partially submerged volcanic crater which forms a small, uninhabited islet located in Alalakeiki Channel between the islands of Maui and Kahoʻolawe, within Maui County in Hawaiʻi. It is the remains of one of the seven Pleistocene epoch volcanoes that formed the prehistoric Maui Nui island, during the Quaternary Period of the Cenozoic Era.