Wikipedia
Svitiaz is the deepest lake in Ukraine, with a maximum depth of 58.4 m. It is the second largest in the country. Svitiaz belongs to groups of Shatsk's lakes, which are located in Polissya ( Volyn region) in the utmost north-western corner of Ukraine, close to the borders with Poland and Belarus. The lake is part of Shatsky National Natural Park ( Shatsk Raion, Volyn Oblast). In the middle of the lake there is an island of 7 hectares in size. The lake occupies an area of 25.2 km², the average depth is 6.9 m., the transparency of water to 8 m. The length of the lake is 9.3 km. The biggest width is 8 km. Volume of the lake is 180 mill. km³.
The lake warms in the summer and its clean water and sandy bottom makes it a very popular tourism site.