Hungary-Lake Hévíz (There are only two lakes in the world which water is warm in winter too. One of them is in New Zeland and the other is this lake in Hévíz, Hungary. It is the biggest hot water "spa-lake" in Europe.
A famous vacation spot in Hungarian - Lake Balaton. It is central Europes largest fresh water lake. And its also called the Hungarian Sea. One of the interesting things you dont want to miss when you visit Lake Balaton is wine-tasting.