Lake Balaton is a freshwater lake in the Transdanubian region of Hungary. It is the largest lake in Central Europe, and one of its foremost tourist destinations. As Hungary is landlocked, it is often affectionately called the "Hungarian Sea". The Zala River provides the largest inflow of water to the lake, and the canalized Sió is the only outflow. The mountainous region of the Northern shore is known as a major wine region, while the flat Southern shore is known for its resort towns.