Wielki Staw Polski is the deepest and longest (998 metres) lake in the Tatra Mountains, and the third-deepest lake in Poland (the deepest is Hańcza). Its volume is around 13 million m³ of water, and it is the largest lake by volume in the Tatra Mountains, making up a third of the entire volume of all Tatra lakes. The highest temperature of its water was 11.2 °C (52.2 °F).[3]