Cologne is the largest city of Germany's most populous state of North Rhine-Westphalia and the fourth-most populous city in Germany. With slightly over a million inhabitants within its city boundaries, Cologne is the largest city on the Rhine and also the most populous city of both the Rhine-Ruhr Metropolitan Region and the Rhineland. Centered on the left bank of the Rhine, Cologne is about 45 kilometres (28 mi) southeast of North Rhine-Westphalia's capital of Düsseldorf and 25 kilometres (16 mi) northwest of Bonn. It is the largest city in the Central Franconian and Ripuarian dialect areas.