Mostki is a spot on the Zalew Włocławski (Włocławek Reservoir), the largest reservoir on the Vistula. The dam created a vast body of water used for kitesurfing. The reservoir offers good sailing distances. Depth is variable and the bottom can be muddy. In strong winds, chop is significant on this large expanse. West and southwest winds are most frequent. The Zalew Włocławski is the main spot for riders from the Włocławek and Toruń region.