Bornheim is a town in the Rhein-Sieg

Rhein-Sieg

The Rhein-Sieg-Kreis is a Kreis in the south of North Rhine-Westphalia, Germany. Neighboring districts are Rheinisch-Bergischer Kreis, Oberbergischer Kreis, Altenkirchen, Neuwied, Ahrweiler, Euskirchen, Rhein-Erft-Kreis, the urban district of Cologne...

 district, 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...

. It is situated on the West bank of the Rhine, approx. 10 km north-west of Bonn

Bonn

Bonn is the 19th largest city in Germany. Located in the Cologne/Bonn Region, about 25 kilometres south of Cologne on the river Rhine in the State of North Rhine-Westphalia, it was the capital of West Germany from 1949 to 1990 and the official seat of government of united Germany from 1990 to 1999....

, 20 km south of Cologne

Cologne

Cologne is Germany's fourth-largest city , and is the largest city both in the Germany 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...

.

The town borders on Bonn

Bonn

Bonn is the 19th largest city in Germany. Located in the Cologne/Bonn Region, about 25 kilometres south of Cologne on the river Rhine in the State of North Rhine-Westphalia, it was the capital of West Germany from 1949 to 1990 and the official seat of government of united Germany from 1990 to 1999....

 to the south, the towns of Alfter

Alfter

Alfter is a municipality in the Rhein-Sieg district, in North Rhine-Westphalia, Germany. It is situated approx. 6 km west of Bonn.-Location:The community of Alfter lies west of former capital of Bonn, on the southern Ridge of the "Vorgebirge"...

 and Swisttal

Swisttal

Swisttal is a municipality in the Rhein-Sieg district, in North Rhine-Westphalia, Germany. Swisttal received its names from a brook named Swist, which flows in the middle of the municipality.-Geography:...

 to the southwest, the town of Weilerswist

Weilerswist

Weilerswist is a municipality in the district of Euskirchen in the state of North Rhine-Westphalia, Germany. It is located in the Eifel hills, approximately 10 kilometers north of Euskirchen, and 20 kilometers south-west of Cologne....

 to the west, the towns of Brühl

Brühl, North Rhine-Westphalia

Brühl is a town in the Rhineland of Germany. It is located in Rhein-Erft-Kreis, 20 km south of Cologne city center and at the edge of Naturpark Kottenforst-Ville Nature Reserve.-History:...

 and Wesseling

Wesseling

Wesseling is an industrial German city on the Rhine bordering Cologne city on the south. Wesseling originates from the Latin „Wasliacum“ which means "Villlage of Waslica" The story that Wesselig originates from "changing of the rope"...

 to the north, as well as the Rhine-bordering town of Niederkassel

Niederkassel

Niederkassel is a town in the Rhein-Sieg district, in North Rhine-Westphalia, Germany, with a population of around 37,000 people. It is situated on the right bank of the Rhine, approx. 10 km north-east of Bonn and 15 km south-east of Cologne...

 in the east.

Bornheim is divided up into 14 districts: Bornheim, Brenig, Dersdorf, Hemmerich, Hersel, Kardorf, Merten, Rösberg, Roisdorf, Sechtem, Uedorf, Walberberg, Waldorf and Widdig.