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Physiographically, it is a peninsular region in south-central Asia delineated by the Himalayas in the north, the Hindu Kush in the west, and the Arakanese in the east. It extends southward into the Indian Ocean with the Arabian Sea to the southwest and the Bay of Bengal to the southeast. Most of this region rests on the Indian Plate and is isolated from the rest of Asia by large mountain barriers. Laccadive Islands, Maldives and the Chagos Archipelago are three series of coral atolls, cays and Faroes on the Indian plate along with the Chagos–Laccadive Ridge, a submarine ridge that was generated by the northern drift of the Indian Plate over the Réunion hotspot during the Cretaceous and early Cenozoic times. The Maldives archipelago rises from a basement of volcanic basalt outpourings from a depth of about 2000 m forming the central part of the ridge between Laccadives and the Great Chagos Bank.