Hungary's landscape consists mostly of the flat to rolling plains of the Carpathian Basin, with hills and lower mountains to the north along the Slovakian border (highest point: the Kékes at 3,327 ft; 1,014 m). Hungary is divided in two by its main waterway, the Danube (Duna); other large rivers include the Tisza and Dráva, while the western half contains Lake Balaton, a major body of water. The largest thermal lake in the world, Lake Hévíz (Hévíz Spa), is located in Hungary. The second largest lake in the Carpathian Basin (and probably the largest artificial lake in Europe) is Lake Theiss (Tisza-tó).
Hungary has a continental climate, with cold, cloudy, humid winters and warm to hot summers. Average annual temperature is 9.7 °C (49.5 °F). Temperature extremes are about 38 °C (100 °F) in the summer and −29 °C (−20 °F) in the winter. Average temperature in the summer is 27 to 32 °C (81 to 90 °F), and in the winter it is 0 to −15 °C (32 to 5 °F). The average yearly rainfall is approximately 600 millimetres (24 in). A small, southern region of the country near Pécs enjoys a Mediterranean climate.
The relative isolation of the Carpathian Basin makes it susceptible to droughts and the effects of global warming are already felt. According to popular opinion, and many scientists in the latest decades the country became drier, as droughts are quite common; and summers became hotter, winters became milder. Because of these reasons snow has become much more rare in the area than before. Popular opinion also states that the four-season system became a two-season system as spring and autumn are getting shorter and shorter, even vanishing some years.
Most of Hungary is covered by agricultural plains, there are but few remnants of its original forests.