Thekkady Lake, also known as Periyar Lake, is an artificial reservoir within Periyar Wildlife Sanctuary in Thekkady, Kerala, formed by the Mullaperiyar Dam across the Periyar River. It serves as a key water source for the region's wildlife. Boat rides on the lake give visitors a chance to spot elephants, bison, and deer along the shores, set against dense forest and rolling hills, making it a popular draw for birdwatching and nature photography.