वेबFor other uses, see Chennai (disambiguation). Chennai ( / ˈtʃɛnaɪ / ⓘ, Tamil: [ˈt͡ɕenːaɪ̯], IAST: Cennaī ), formerly known as Madras, [b] is the capital city of Tamil Nadu, the southernmost state of India. It is the state's primate city and is located on the Coromandel Coast of the Bay of Bengal.