Sopron is a city in Hungary on the Austrian border, near Lake Neusiedl/Lake Fertő. When the area that is today Western Hungary …Sopron is a city in Hungary on the Austrian border, near Lake Neusiedl/Lake Fertő. When the area that is today Western Hungary was a province of the Roman Empire, a city called Scarbantia stood here. The site of its forum is now the main square of Sopron.