Sasthamkotta Lake also categorized as a wetland, is the largest fresh water lake in Kerala, a state of India on the south of the West Coast. The lake is named after the ancient Sastha temple (a pilgrimage centre) located on its bank. It meets the drinking water needs of half million people of the Quilon district and also provides fishing resources. The purity of the lake water for drinking use is attributed to the presence of large population of larva called cavaborus that consumes bacteria in the lake water.[1] The lake is a designated wetland of international importance under the Ramsar Convention since November 2002.The lake is located at a distance of 25 km from Quilon city, which is on the northern side of Ashtamudi Lake. Thiruvananthapuram International Airport, at 105 km, is the nearest airport to Kollam. Karunagapally, at a distance of 8 km, is the closest town to the lake. A ferry service across the lake transports people between West Kallada and Sasthamkotta.