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Lake Roś (Polish: Jezioro Roś, German: Roschsee) is a lake in the Masurian Lake District of the Warmian-Masurian Voivodeship of Poland. This S-shaped glacial lake has an area of 18.9 km² and a depth of 31.8 metres. The Swięcek and Konopka rivers flow into the lake, while the Pisa River flows out of it. The largest town on the lake is Pisz.

Lake Roś
Poland Ros Lake sunset.jpg
LocationMasurian Lake District, Poland
Coordinates53°40′1″N 21°53′36″E / 53.66694°N 21.89333°E / 53.66694; 21.89333Coordinates: 53°40′1″N 21°53′36″E / 53.66694°N 21.89333°E / 53.66694; 21.89333
Primary inflowsSwięcek and Konopka
Primary outflowsPisa
Basin countriesPoland
Surface area18.9 km2 (7.3 sq mi)
Max. depth31.8 m (104 ft)