Třeboň, or Wittingau in German, has one of the best-preserved medieval squares in Bohemia. In fact, only its shape dates from medieval times, since its current form, with its Renaissance and Baroque houses, resulted from the flourishing fish trade of the 14th century. Beginning in the mid-14th century, the natural landscapes around the city were gradually transformed by human intervention. The marshlands gave way to a dense network of over 500 lakes, grouped into 16 aquatic systems, today a paradise returned to the wilderness and populated with rare species of plants and animals. The largest of these lakes is located right near the city and is tied to the Rosenberg family, owners of the medieval burg. Like all historical cities in Bohemia and Moravia, this square contains a plague column; a Renaissance fountain; and a tower building belonging to the City Hall.