Which lake in the Masurian Lake District is Poland's largest?

Śniardwy is the largest lake in Poland, occupying 113.8 square kilometres in the Masurian Lake District.

The lake is in the Warmian–Masurian Voivodeship and is glacial in origin. Retreating ice shaped its broad basin, while meltwater and later drainage helped form the modern lake. Śniardwy measures about 22.1 kilometres from end to end and 13.4 kilometres across, yet its maximum depth is only 23 metres, giving it a wide, relatively shallow profile.

Readers sometimes confuse Śniardwy with Mamry or Niegocin, other major Masurian lakes. Śniardwy remains the national size leader, and it is also historically notable: when Warmia-Masuria belonged to Prussia and Germany, it was regarded as the largest lake in those territories.

The lake has eight islands and belongs to a connected water network. It links with lakes including Mikołajskie, Łuknajno, Roś and Tyrkło, while canals and locks connect parts of the wider Masurian boating region.