Tamil Nadu, state of India, located in the extreme south of the subcontinent. It is bounded by the Indian Ocean to the east and south and by the states of Kerala to the west, Karnataka (formerly Mysore) to the northwest, and Andhra Pradesh to the north. Enclosed by Tamil Nadu along the north-central coast are the enclaves of Puducherry and Karaikal, both of which are part of Puducherry union territory. The capital is Chennai (Madras), on the coast in the northeastern portion of the state.
Tamil Nadu represents the Tamil-speaking area of what was formerly the Madras Presidency of British India. The Tamils are especially proud of their Dravidian language and culture, and they have notably resisted attempts by the central government to make Hindi (an Indo-Aryan language) the sole national language. While it has an industrial core in Chennai, the state is essentially agricultural. Area 50,216 square miles (130,058 square km). Pop. (2011) 72,138,958.
Tamil Nadu is divided naturally between the flat country along the eastern coast and the hilly regions in the north and west. The broadest part of the eastern plains is the fertile Kaveri (Cauvery) River delta; farther south are the arid flatlands surrounding the cities of Ramanathapuram and Madurai (Madura). The high peaks of the Western Ghats run along the state’s western border. Various segments of this mountain range— including the Nilgiri, Anaimalai, and Palni hills—have peaks exceeding 8,000 feet (2,400 metres) in elevation. Anai Peak, at 8,842 feet (2,695 metres) in the Anaimalai Hills, is the highest mountain in peninsular India. The lower peaks of the Eastern Ghats and their outliers—locally called the Javadi, Kalrayan, and Shevaroy hills—run through the centre of the region. Tamil Nadu’s major rivers—the Kaveri, the Ponnaiyar, the Palar, the Vaigai, and the Tambraparni—flow eastward from the inland hills.