Sivaganga Fort Complex is an amalgamation of several sites and it easily takes one an entire day to explore. It comprises the Sivaganga Fort, the Big Temple (Peruvudaiyar Kovil), and the Sivaganga Park, which further holds a 1,000-year-old tank and an amusement park. In addition, there is a small library to entertain the kids. The Sivaganga Fort was built by Sasivarna in the 16th century and was home to his wife Rani Velu Nachiyar long after his death. It is currently under the care of Archaeological Survey of India (ASI). The tank in the park had been built by Raja Raja Chola as a water harvesting system for the Big Temple in the 8th century.The tank had underground connections with all the tanks in town and was sprawled across five acre of land. Apart from the tank, the Sivaganga Poongai has also emerged as a star attraction for travelling families. It is Thanjavur's first-ever amusement park. The park has a variety of water rides, motor-boating facilities, lush gardens and a toy train.

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