Hungary is a beautiful country in the western part of the CEE region, renowned for its numerous World Heritage Sites, such as the Old Village of Hollókő, the Caves of Aggtelek, the Hortobágy National Park and others. Lake Balaton is the largest freshwater lake in Central Europe and a very popular holiday destination. The Danube is the longest river in Europe, connecting ten European countries. The longest river of the country is the Tisza, which has an interesting history. Its regulation was the biggest undertaking in the 19th century, transforming the river into a navigable waterway and converting the dried floodplain into agricultural areas. Hungary is also home to a wealth of thermal water springs – more than 1,300, with 123 in Budapest alone –, offering infinite opportunities for year-round bathing in spas all over the country.