Kąpielisko Centralnego Ośrodka Sportu-Ośrodek Przygotowań Olimpijskich W Giżycku (Cos-Opo)

Poland Lake 1 - Excellent

The COS-OPO bathing water is located on the western shore of Lake Kisajno in Giżycko, Poland. Lake Kisajno is the southernmost reservoir in the Mamr complex, measuring 8.5 km in length and 3 km in maximum width, with a water surface area of 1896 hectares. The bathing area has a shoreline of 50 meters and operates within the Olympic Preparation Center's yacht harbor. The lake has an average depth of 8.4 meters and a maximum depth of 25 meters.

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Water

Lake Kisajno. Area: 1896 hectares. Length: 8.5 kilometers. Maximum width: 3 kilometers. Average depth: 8.4 meters. Maximum depth: 25 meters.

Location

Giżycko, Moniuszki 22, Warmian-Masurian Voivodeship, Giżycko County, Poland. The bathing water is situated in the western part of the COS-OPO Yacht Harbor on the shore of Lake Kisajno.

Facilities

Enclosed area. Pier and jetty. Water intake point. Waste bins. Toilet. Changing rooms. Shallow water bathing area for children. Prohibition on domestic animals. Information board. Beach regulations available for review.

Season

July 1 to August 31, 2025. Operating hours: 10:00 to 18:00.

Water Quality

Water quality classification: Excellent (2025, 2024, 2023, 2022, 2021). Monitoring results show E. coli and Enterococcus concentrations consistently well below maximum allowable levels. Maximum permissible concentrations: E. coli 1000 CFU/100 ml; Enterococci 400 CFU/100 ml. All water samples tested have been rated as suitable for bathing.