Karaś is a lake in the Masurian Lake District of north-eastern Poland, from the town of Iława in Warmian-Masurian Voivodeship.
The lake is the site of a nature reserve, established in 1958 and covering an area of . Since 1984 it has been protected under the Ramsar convention as an important breeding ground for water birds. It is currently one of 13 such sites in Poland.
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