Maui Nui

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Maui Nui, also called Greater Maui, was a prehistoric Hawaiian Island built from seven shield volcanoes. "Nui" means "great/large" in the Hawaiʻian language.

At 1.2 million years ago, Maui Nui was as much as 50% larger than the present-day Island of Hawaiʻi.[1] Sea levels were lower than today's much of the time, mainly due to glaciation during ice ages, thus exposing more land. As the volcanoes slowly settled by subsidence due to the weight of the shield volcanoes and erosion, the saddles between them slowly flooded, forming four separate islands: Maui, Molokaʻi, Lānaʻi and Kahoʻolawe by about 200,000 years ago. Another volcano west of Molokaʻi, was completely submerged and covered with a cap of coral; it is now known as Penguin Bank.

The sea floor between these four islands is relatively shallow, about 500 m deep. But at the outer edges of former Maui Nui, as with the edges of all Hawaiian Islands, the floor plummets to the abyssal ocean floor of the Pacific Ocean. The steep slopes can result in massive landslides due to flank collapse, including one which removed most of the northern half of East Molokaʻi.