Coorinates: 10°49′N 78°41′E / 10.81, 78.69 Tiruchirappalli (Tamil : திருச்சிராப்பள்ளி) pronunciation (help·info) also spelled Tiruchirapalli, commonly known as Tiruchi or Trichy (Tamil : திருச்சி) formerly also pronounced as Trichinopoly (under British rule) is the fourth largest city of the Indian state of Tamil Nadu (after Chennai, Coimbatore and Madurai). It is situated in the centre of the state, on the banks of the Cauvery River. Trichy is a corporation and the administrative headquarters of Tiruchirapalli District.