Jeziorak is a lake in the Iława Lake District in Warmia-Masuria, Poland. Its area is 3,219 ha. It is 27.45 kilometres (17.06 mi) long and 2.4 kilometres (1.5 mi) across at its widest. The maximum depth is 13 metres (43 ft). It is the longest lake in Poland, and ranks 6th by area.