à Âniardwy (, ) is a lake in the Masurian Lake District of the Warmian-Masurian Voivodeship, Poland.
At , à Âniardwy is the largest lake in Poland. It was also the largest lake in Prussia and in Germany, when Warmia-Masuria was under German rule and formed the southern part of East Prussia. It is long and wide. The maximum depth is 23 metres (75 feet). There are eight islands on the à Âniardwy lake.
à Âniardwy was formed by retreating ice sheet and draining floodwaters occurring as the result of ice calving ahead of the receding glacier. Among the eight islands are: Szeroki Ostrów, Czarci Ostrów, Wyspa PajÃÂcza, Wyspa Kaczor and others. Surrounding settlements include Popielno, Gà Âodowo, Niedà ºwiedzi Róg, Okartowo, Nowe Guty, ZdÃÂgowo and à Âuknajno.
Among the many inlets, two are named as separate lakes: Warnoà Âty and Seksty. à Âniardwy connects with the following lakes: Tuchlin, à Âuknajno, Mikoà Âajskie, Roà Â, Biaà Âoà Âawki and Tyrkà Âo. It is surrounded by the system of canals known as Kanaà Ây Mazurskie (Masurian Canals), with numerous sluices. Together, they form the Polish Masurian Lake District.
It is one of the few reservoirs that has 2 surface outflows: Jeglin Canal, leading to Lake Roà Â, and the Wyszka River, flowing into Lake Biaà Âoà Âawki. Both watercourses have a regulated flow (lock, weir).