Odisha (formerly Orissa) is one of the 28 states of India, located in the eastern coast. It is surrounded by the states of West Bengal to the north-east, Jharkhand to the north, Chhattisgarh to the west and north-west, Andhra Pradesh to the south and south-west. Odia (formerly known as Oriya) is the official and most widely spoken language, spoken by 33.2 million according to the 2001 Census.The modern state of Odisha was established on 1 April 1936, as a province in British India, and consisted predominantly of Odia-speaking regions. April 1 is celebrated as Odisha Day.