Andhra Pradesh (English: Telugu: ) is a state in the south-eastern coastal region of India. It is the seventh-largest state by area covering an area of and tenth-most populous state with 49,386,799 inhabitants. It is bordered by Telangana to the north-west, Chhattisgarh to the north, Odisha to the north-east, Tamil Nadu to the south, Karnataka to the west and the Bay of Bengal to the east. It has the second longest coastline in India after Gujarat, of about . Andhra Pradesh is the first state to be formed on a linguistic basis in India on . Andhra Pradesh was once a major Buddhist pilgrimage site in India and a Buddhist learning center which can be seen in many sites in the state in the form of ruins, chaityas and stupas Andhra Pradesh is also known as the land of the world-famous diamond Koh-i-Noor and many other global known diamonds due to their source in its Kollur Mine. It is also known as the "rice bowl of India" for being a major producer of rice in India. Its official language is Telugu; one of the classical languages of India, the fourth most spoken language in India and the 11th-most spoken language in the world.