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  Kalyan Sagar is located on the eastern side of the Mata Tripuraswari Temple which is 3 km. away towards south from Udaipur town, Tripura. A big lake Kalyan Sagar just down to the Hillock at the backside of the Temple adds to its beauty. This natural pond has varieties of aqua species. The area of the Kalyan Sagar Lake is 2.752 acre. The lake is considered sacred and devotees worship the fishes and tortoises present here. Kalyan Sagar is famous for very rare species of tortoise in large numbers. The Matabari Temple Committee is cementing the banks of Kalyan Sagar Lake for the last 2-3 years. 

The water of the lake became acidic due to destruction of the ecosystem around the lake. This has resulted in death of tortoise, as the cemented embankments spoiled the natural habitat as well as places for laying eggs for this turtles. As an amphibian it is extremely essential for the tortoise to have sandy exposure, which is not available in the lake after the construction of walls around the water body. Death of at least 7 tortoise have been reported in the last 6 months. Carrying of plastic poly bags are banned in and around Matarbari Temple area since 1998, even before the banning order issued by Tripura State Pollution Control Board (TSPCB) for the entire State of Tripura on 21st January 2002. But visitors, tourists, pilgrims and devotees are throwing plastic carry bags every day into the lake. As a result the bed of the lake is now full of polythene/plastics bags. 

To assess the situation and the state of the natural habitat of the tortoise, a team of TSPCB consisting of Scientist and Engineer visited the lake and interacted with the local people on March 22, 2003. To check the water quality of the lake, TSPCB collected water samples from four locations of the lake and analyzed the different parameters of the water quality. The results of the study show that the water quality of the lake is very good and even drinkable. According to the experts, it is only the construction of the embankments that increased the mortality of the turtles. 

  Research paper:

Environmental and ecological assessment of Kalyan Sagar (matabari dighi)