Haridra Nadhi
Haridra Nadhi is the largest temple tank in India, may be in the World. It is in Mannargudi, Thiruvarur District of Tamil Nadu.    This temple tank belongs to Rajagopalaswamy Temple, Mannargudi. The area of the temple tank is . The Rajagopalaswamy temple is a Vaishnavite temple of the main god Rajagopalaswamy (Krishna). The tank is also called the sister of river Kaveri and is sacred to Vaishnavates.