The Bröl is a 45.1 km long right tributary

Tributary

A tributary or affluent is a stream or river that flows into a main stem river or a lake. A tributary does not flow directly into a sea or ocean...

 of the Sieg River in North Rhine-Westphalia

North Rhine-Westphalia

North Rhine-Westphalia is the most populous state of Germany, with four of the country's ten largest cities. The state was formed in 1946 as a merger of the northern Rhineland and Westphalia, both formerly part of Prussia. Its capital is Düsseldorf. The state is currently run by a coalition of the...

, Germany

Germany

Germany , officially the Federal Republic of Germany , is a federal parliamentary republic in Europe. The country consists of 16 states while the capital and largest city is Berlin. Germany covers an area of 357,021 km2 and has a largely temperate seasonal climate...

.

The river flows through the districts

Districts of Germany

The districts of Germany are known as , except in the states of North Rhine-Westphalia and Schleswig-Holstein where they are known simply as ....

 of Rhein-Sieg-Kreis and Oberbergischer Kreis. The river's source is in the town of Waldbröl

Waldbröl

Waldbröl is a town is in the southern part of the Oberbergischer Kreis , in North Rhine-Westphalia, Germany.-Geographical location:The city lies on the slopes of the Nutscheid and is part of the Naturpark Bergisches Land...

 at an elevation of 368 meters above sea level

Sea level

Mean sea level is a measure of the average height of the ocean's surface ; used as a standard in reckoning land elevation...

. It flows in a southwest direction through the Bergisches Land

Bergisches Land

The Bergisches Land is a low mountain range region within the state of Nordrhein-Westfalen, Germany, east of Rhine river, south of the Ruhr. The landscape is shaped by woods, meadows, rivers and creeks and contains over 20 artificial lakes...

 and past the Homburg Castle

Homburg Castle

Homburg Castle is an old hill castle in Nümbrecht, Oberbergischer Kreis in the German state of North Rhine-Westphalia.-History and construction :...

. In the town of Ruppichteroth

Ruppichteroth

Ruppichteroth is a municipality in the Rhein-Sieg district, in the southern part of North Rhine-Westphalia, Germany. It is located approx. 30 kilometers east of Bonn.-Districts:In 1969, the old municipality of Winterscheid became part of Ruppichteroth...

, a small tributary called the Waldbrölbach joins the Bröl. It eventually flows to the town of Hennef where it joins the Sieg at an elevation of 67 meters.