Odisha (formerly Orissa), an eastern Indian state on the Bay of Bengal, is known for its tribal cultures and its many ancient Hindu temples. The capital, Bhubaneswar, is home to hundreds of temples, notably the intricately-carved Mukteshvara. The Lingaraj Temple complex, dating to the 11th century, is set around sacred Bindusagar Lake. The Odisha State Museum is focused on the area’s history and environment. Odisha is one of the 29 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 and Telengana to the south and south-west. Odisha has 485 kilometres (301 mi) of coastline along the Bay of Bengal on its east, from Balasore to Malkangiri. It is the 9th largest state by area, and the 11th largest by population. Odia (formerly known as Oriya) is the official and most widely spoken language, spoken by 33.2 million according to the 2001 Census. The ancient kingdom of Kalinga, which was invaded by the Mauryan emperor Ashoka in 261 BCE resulting in the Kalinga War, coincides with the borders of modern-day Odisha. The modern state of Orissa 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. The region is also known as Utkala and is mentioned in India's national anthem, "Jana Gana Mana". Cuttack was made the capital of the region by Anantavarman Chodaganga in c. 1135, after which the city was used as the capital by many rulers, through the British era until 1948. Thereafter, Bhubaneswar became the capital of Odisha.