Maui Nui

Maui Nui, also called Greater Maui, was a giant prehistoric Hawaiian Island with six shield volcanoes. At its greatest size, it was larger than the Island of Hawai‘i is today. As the island shrank, and most of the saddles flooded, only four islands remained: Maui, Moloka‘i, Lāna‘i and Kaho‘olawe. As a legacy of the former island, the sea floor inbetween these four islands is relatively shallow. But at the outer edges of former Maui Nui, as with the edges of modern Hawaii island, the floor plummets to the abyssal ocean floor of the Pacific Ocean.