Koblenz is a city in western Germany, located on both sides of the Rhine at its confluence with the Moselle. The city has around 107,000 inhabitants and is the largest city in the state of Rhineland-Palatinate. Koblenz was founded by the Romans in the late 1st century BC. The city became a municipality in 1866 and was elevated to the status of a city in 1932. Koblenz lies in the Rhineland and is a popular tourist destination due to its location on the Rhine and its historic buildings. The city is home to the Fernsehturm Koblenz, a telecommunications tower, the tallest structure in the Rhineland. It also houses the Bundesanstalt für Wasserbau, an institution of the Federal Republic of Germany responsible for water management.