Vattakottai Fort is a seaside fort near Kanyakumari, the southern tip of India. It was built in the 18th century as a coastal defence-fortification and barracks in the erstwhile Travancore kingdom.
It was constructed under the supervision of Captain Eustachius De Lannoy, an ex-Dutch naval officer of the VOC, who became commander of the Travancore army (the very army that defeated him in the Battle of Colachel) in the 18th century, after he earned the trust of the Travancore King Marthanda Varma. De Lannoy constructed Vattakottai, as part of the defence-fortifications he undertook throughout Travancore.
The fort is made of granite blocks and, today, a part of the fort extends into the sea. It is a protected site under the Indian archaeological department. A major renovation of the fort was undertaken recently by the department, and the site is now a popular tourist spot.
Vattakottai Fort commands a picturesque view of both the sea on the one side, and the hills (Western Ghats) on the other . Another interesting feature near the site is a beach of black sands. It is about 7 km from Kanyakumari town.