Blatná is a town in the South Bohemian Region of the Czech Republic. It has about 6,600 inhabitants. It is known by a water castle in the center of an artificial lake and a landscape garden around it. Blatná lies in a pleasant rolling countryside with a mosaic of fields, meadows and hundreds of ponds.
The town lies on the small river of Lomnice. Since the Middle Ages, people have been transforming the land by building plethora of small to large lakes which now grace the area. The largest artificial lake is Labuť (Swan) at 108.5 ha some 5 km to the north-east of the town.