Economy of Hungary and the Tisza. The Danube also flows through parts of Germany, Austria, Slovakia, Serbia, and Romania. It is navigable within Hungary for 418 km. The Tisza River is navigable for 444 km in the country. Hungary has three major lakes. Lake Balaton, the largest, is 78 km long and from 3 to 14 km wide, with an area of 592 km. Lake Balaton is Central Europe's largest lake and a prosperous tourist spot and recreation area. Its shallow waters offer summer bathing and during the winter its frozen surface provides facilities for winter sports. Smaller bodies of water include Lake
Petenwell Lake northern pike, bass, panfish, and muskellunge. The area around the lake has restaurants, a community theater, a golf course and two casinos. Lake Petenwell has blue-green algae blooms in the summer, the toxicity of which is unknown. The algae, which exists naturally in most lakes, is magnified on Lake Petenwell as a result of industrial and agricultural sources upstream. Petenwell Lake Lake Petenwell is a man-made lake in central Wisconsin, in Adams, Juneau, and Wood counties next to Castle Rock Lake. It covers over and is deep. Lake Petenwell is Wisconsin's second largest lake at or approximately . It was