Lake Zninskie Duze (Jezioro Duze Zninskie) is a lake located near Znin, in Kuyavia-Pomerania. It is a local kitesurfing spot appreciated by riders from the Bydgoszcz area. The water body is medium-sized, offering decent sailing distances. The depth is moderate with a sandy bottom in places. Conditions are flat water to slightly choppy. The lake works with winds from most directions. West winds are the most frequent. It is a local spot for riders in north-central Poland.