Wrocław is the largest city in western Poland. It is on the River Oder in the Silesian Lowlands of Central Europe, roughly 350 kilometres from the Baltic Sea to the north and 40 kilometres from the Sudeten Mountains to the south. Wrocław is the historical capital of Silesia and Lower Silesia. Today, it is the capital of the Lower Silesian Voivodeship. At various times in history, it has been part of the Kingdom of Poland, Bohemia, Hungary, the Austrian Empire, Prussia and Germany. It became part of Poland in 1945, as a result of the border changes after the Second World War. The population of Wrocław in 2016 was 637,075 making it the fourth-largest city in Poland and the main city of Wrocław agglomeration.