West Bengal is an Indian state located in the eastern region of the country along the Bay of Bengal. With over 91 million inhabitants (as of 2011), it is India's fourth-most populous state. It has an area of 88,752 km2 (34,267 sq mi). A part of the ethno-linguistic Bengal region of the Indian subcontinent, it borders Bangladesh in the east, and Nepal and Bhutan in the north. It also borders the Indian states of Odisha, Jharkhand, Bihar, Sikkim, and Assam. The state capital is Kolkata (Calcutta), the seventh-largest city in India, and center of the third-largest metropolitan area in the country. As for geography, West Bengal includes the Darjeeling Himalayan hill region, the Ganges delta, the Rarh region, and the coastal Sundarbans. The main ethnic group are the Bengalis, with Bengali Hindus forming the demographic majority.