The Rost Reef is a deep-water coral reef located about 100 kilometres (62 mi) west of the island of Rostlandet in Norway's Lofoten archipelago. Situated on the floor of the Norwegian Sea, the 43 kilometers (27 mi) long by 6.9 kilometers (4.3 mi) wide reef was produced by the coral Lophelia pertusa. Rost Reef is only reachable by submarine. - AsNotedIn