Sasthamkotta, or Sasthamcotta, is a village in the Kunnathoor Tehsil of Kollam district in the state of Kerala, India. Kunnathoor taluk headquarters is located at Sasthamkotta. The Sasthamkotta freshwater lake is the largest freshwater lake in Kerala. The place is naturally beautiful and is surrounded by hills and valleys. In the midst of the hills is the Fresh Water Lake. The extensive freshwater lake here is the biggest of its kind in Kerala. Water supply to the Kollam town is met by purifying the water from this lake.Sasthamkotta is connected to all nearby cities and towns by road. Karunagappally, Adoor via NH-183A, Kottarakkara, chengannur, kayamkulam etc., KSRTC operates venad chain bus service from Kollam-Pathanamthitta, Karunagappally-Kottarakkara, which are pass-through Sasthamkotta and chengannur-Kollam Pass through Bharanikkavu
