Śniardwy (German:  der Spirdingsee ) is a lake in the Masurian Lake District of the Warmian-Masurian Voivodeship, Poland. It is the largest lake in Poland with an area of 113.8 square kilometres (43.9 sq mi). It is 22.1 kilometres (13.7 mi) long and 13.4 kilometres (8.3 mi) wide. The maximum depth is 23 metres (75 feet).