Odisha is formerly known as Orissa) is one of the 29 states of India. Located in eastern India, it is surrounded by the states of West Bengal to the north-east, Jharkhand to the north, Chhattisgarh to the west and north-west, and Andhra Pradesh to the south. Odisha has 485 kilometers (301 mi) of coastline along the Bay of Bengal on its east, from Balasore to Ganjam. It is the 9th largest state by area and the 11th largest by population. The state also has the third largest population of Scheduled Tribes in India. Odia is the official and most widely spoken language, spoken by 36.6 million according to the 2016 Census.