Senji Fort(செஞ்சிக் கோட்டை) is located in Tamil Nadu

Senji Fort or Gingee Fort (also known as Chenji, Jinji or Senchi) in Tamil Nadu, India is one of the surviving forts in Tamil Nadu, India. It lies in Villupuram District, 160 kilometres (99 mi) from the state capital, Chennai, and is close to the Union Territory of Puducherry. The fort is so fortified, that Shivaji, the Maratha king, ranked it as the "most impregnable fortress in India" and it was called the "Troy of the East" by the British. The nearest town with a railway station is Tindivanam and the nearest airport is Chennai (Madras), located 150 kilometres (93 mi) away.

• http://en.wikipedia.org/wiki/Gingee Fort