The Atlantic has irregular coasts indented by numerous bays, gulfs and seas. In turn, oceanic waters are interspersed by many smaller seas, gulfs, and bays. The sea shores are winding and form gulfs and bays of various sizes. Smaller regions of the oceans are called seas, gulfs, bays and other names. Smaller regions of the oceans are called seas, gulfs, bays, straits, and other terms. There are four main bays or gulfs on the White Sea. This coast is a mountainous zone with beaches, gulfs and inlets of extraordinary beauty. The seawater marshes correspond to ancient marine gulfs, made from marine or fluvial sediments. Major gulfs include the Gulf of Cambay, Gulf of Kutch, and the Gulf of Mannar. Six of the seas, the two gulfs, and the strait are wholly waters of Indonesia. These "fingers" are separated by two gulfs, the Toronean Gulf and the Singitic Gulf. For reference, islands in gulfs and seas are included in a separate section. The rest of the coast is made up of gulfs and small, hidden sandy beaches. The island's volcanic origin is manifested in several hot springs and the two gulfs. There are also the gulfs of Khambhat and Kutch on the Indian Coast.