The history of Sasthamkotta Lake is intertwined with the ancient Sastha temple located nearby. Legend has it that the lake's purity is due to the presence of 'Kallada' fish, which consume organic matter and keep the water clean. The lake has been a vital source of drinking water for the region for centuries. The Sastha temple, dedicated to Lord Ayyappan, is a significant pilgrimage site, attracting devotees from far and wide. The lake's name, Sasthamkotta, literally translates to 'Sastha's fort,' indicating the temple's historical importance. Over the years, the lake has been recognized for its ecological significance and has been subject to conservation efforts to maintain its pristine condition and protect its unique ecosystem.