The lake water contains a specific type of larva that consumes bacteria, keeping the water naturally pure and potable.
It is the only lake in Kerala designated as a Ramsar site for its crucial role in regional freshwater sustainability.
Despite its proximity to the Arabian Sea, the lake remains completely freshwater with no salinity intrusion.
The lake is named after the ancient Sastha Temple situated on its bank, which is a major local cultural reference point.
Sasthamcotta Lake is the largest freshwater lake in the state of Kerala, covering an area of approximately 3.75 square kilometers. It serves as a vital drinking water source for over half a million people in the Kollam district. The lake is classified as a wetland of international importance under the Ramsar Convention due to its unique ecosystem. Its water is noted for the absence of common minerals and salts, which prevents it from becoming stagnant or contaminated by bacteria. The reservoir is surrounded by hills and supports a diverse range of freshwater fish and flora. The lake maintains a consistent water level throughout the year, fed primarily by underground springs rather than surface inflow. It is a designated protected area to ensure the long-term preservation of its catchment basin.
The elevated vantage points near the Sastha Temple entrance overlooking the expansive main basin.
Carry binoculars to spot the wide variety of migratory birds that frequent the lake borders.
Bring your own drinking water and snacks, as there are limited commercial facilities directly at the shoreline.
Stay on designated walking paths to avoid disturbing the fragile wetland vegetation.
Do not enter the water for swimming, as the lake is a protected drinking water source for the region.
Maintain a quiet demeanor to respect the nearby temple and local wildlife; do not litter near the water's edge.
