Lake Jeziorak is the longest lake in Poland (about 27 km long) and the second largest by area, located in Masuria. The Siemiany spot is on the west shore of the lake. The lake is elongated and narrow, which favors north-south wind axes. Depth is moderate (average 4m) with sandy bottom in places. The lake offers long sailing distances thanks to its elongated shape. West and southwest winds are the most frequent but the wind can be channeled by the shape of the lake. It is a spot in the heart of Masuria, in a preserved natural setting.