Kelsterbach is a town in Groß-Gerau

Groß-Gerau (district)

Groß-Gerau is a Kreis in the south of Hesse , Germany. Neighboring districts are Main-Taunus, district-free Frankfurt, Darmstadt-Dieburg, Bergstraße, Alzey-Worms, Mainz-Bingen, and the district-free cities Mainz and Wiesbaden....

 district in Hessen, 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 lies on Frankfurt

Frankfurt

Frankfurt am Main , commonly known simply as Frankfurt, is the largest city in the German state of Hesse and the fifth-largest city in Germany, with a 2010 population of 688,249. The urban area had an estimated population of 2,300,000 in 2010...

's southwestern outskirts at a bend on the left bank of the river Main, right where a small brook, called the Kelster (and Bach means "brook") empties into the river. After the Frankfurt–Mainz

Mainz

Mainz under the Holy Roman Empire, and previously was a Roman fort city which commanded the west bank of the Rhine and formed part of the northernmost frontier of the Roman Empire...

 railway line was built, this formerly mostly agricultural

Agriculture

Agriculture is the cultivation of animals, plants, fungi and other life forms for food, fiber, and other products used to sustain life. Agriculture was the key implement in the rise of sedentary human civilization, whereby farming of domesticated species created food surpluses that nurtured the...

 village was transformed by the great number of large factories

Factory

A factory or manufacturing plant is an industrial building where laborers manufacture goods or supervise machines processing one product into another. Most modern factories have large warehouses or warehouse-like facilities that contain heavy equipment used for assembly line production...

 that located here, bringing along with them a great upswing in the town's population.