Wielki Staw Polski is the deepest and longest (998 metres) lake in the Tatra Mountains, and the third-deepest lake in Poland (the deepest lake is Hańcza. The lake's volume is around 13 million m³ of water, and it is the largest lake by volume in the Tatra Mountains (its volume makes up one third of all lakes in the Tatra Mountains lakes). The highest temperature of the lake's water was .