Zalew Sulejowski is a large artificial reservoir on the Pilica River, located near Piotrków Trybunalski in the Łódź Voivodeship. The Karolinów spot offers good access to the body of water.

The reservoir covers approximately 27 km² and offers vast riding areas. The depth is moderate (average 3.5m) and the bottom is sandy in places. In strong winds, the fetch creates chop.

West and southwest winds are the most frequent. Zalew Sulejowski is a popular spot for riders from Łódź and central Poland. The season runs from May to October.