The coral atolls are Swains and Rose Atoll. Tuvalu consists of six atolls and three reef islands. Johnston Atoll is one of the world's most isolated atolls. The Northwestern Hawaiian Islands include many atolls, and reefs. American Samoa consists of five main islands and two coral atolls. The Society archipelago is a hotspot volcanic chain consisting of ten islands and atolls. Beaches, coral atolls, islands, and rich fishing grounds surround Cebu. The Red Sea also contains many offshore reefs including several true atolls. Among its 118 islands and atolls, 67 are inhabited. The terrain includes a variety of reefs, atolls, and small islands. Twenty-four of the atolls and islands are inhabited. Platform reefs can be found within atolls. The atolls and reef islands can respond to changes in sea-level. The island is made up of coral atolls and reef flats. Air Marshall Islands flies to most of the Marshalls' inhabited atolls once a week.