Hawaiian Trough the Hawaiian Arch. The Hawaiian Arch extends about 200 meters above the surrounding ocean floor, and contains tilted coral reefs. The coral reefs in the Hawaiian Tough are described as mesophotic coral ecosystems, which can be found between 100 and 500 feet below sea level. 43 percent of fish species documented at the mesophotic reefs are unique to the Hawaiian Islands. At Maui’s ‘Au’au channel the largest uninterrupted mesophotic coral ecosystem was discovered, with an area larger than 3 square miles. These reefs contained many stony, reef building coral that belong to the genus Leptoseris, which are adapted for deep
Geography of the Marshall Islands famous World War II battle ground, is now used as a US missile test range; the island city of Ebeye is the second largest settlement in the Marshall Islands, after the capital of Majuro, and one of the most densely populated locations in the Pacific. This is a list of the extreme points of the Marshall Islands, the points that are farther north, south, east or west than any other location. Geography of the Marshall Islands The Marshalls consist of 29 atolls and five isolated islands, which form two parallel groups—the "Ratak" (sunrise) chain and the "Ralik" (sunset) chain. The