Cologne is Germany's fourth largest city and is the largest city both in the German Federal State of North Rhine-Westphalia and within the Rhine-Ruhr Metropolitan Area, one of the major European metropolitan areas with more than ten million inhabitants.
Cologne is located on both sides of the Rhine River. The city's famous Cologne Cathedral is the seat of the Catholic Archbishop of Cologne. The University of Cologne is one of Europe's oldest and largest universities.
