There are two main types of plains in India: the Northern Plains and the Coastal Plains. The Northern Plains, also known as the Indo-Gangetic Plains, stretch from Punjab to Assam. They are made up of very fertile alluvial soil and contain three major river systems: the Ganga, Brahmaputra, and Satluj. The Coastal Plains are along India's western and eastern coasts. The Western Coastal Plains run along the Arabian Sea from Gujarat to Kanyakumari, containing gulfs and flat lands rich in oil. The Eastern Coastal Plains contain the fertile Coromandel Coast between the Krishna and Kaveri rivers, forming large river deltas.