What is Offenbach (district)?
{{for|other meanings|Offenbach (disambiguation)}} {{Infobox German district| name=Offenbach Rural District (Lankreis Offenbach)| image_coa=Wappen Landkreis Offenbach.svg| image_flag=Flagge Landkreis Offenbach.svg| state=Hesse| capital=[[Dietzenbach]]| regierungsbezirk=[[Regierungsbezirk Darmstadt|Darmstadt]]| Kreisschlüssel = 06438| area=356.29| population=336.818| population_as_of=31.12.2008| density=945| carsign=OF| url=[http://www.kreis-offenbach.de www.kreis-offenbach.de]| map=Hesse OF(district).svg |coordinates = {{coord|50.018236 |8.785651 |display=title|format=dms}} }} '''Offenbach Rural District''' is a [[Rural Districts of Germany|rural district]] ({{lang-de|Landkreis}}) in the south of [[Hesse]], [[Germany]]. It is a part of the [[Darmstadt Government Region]] ({{lang-de|Regierungsbezirk Darmstadt}}). == Geography == [[File:Lage von Rodgau.png|thumb|left|The cities of the Offenbach Rural Distirct are in the middle of the Rhine Main area.]] The Offenbach Rural District is in the middle of the ''Rhine Main area'' in the south of the [[States of Germany|state]] of Hesse. The district is in the [[metropolitan area]] of [[Frankfurt am Main|Frankfurt]]. In the east it touches the state of [[Bavaria]]. The whole area of the district is 356.29&nbsp;km<sup>2</sup> large and it is about 100 – 150 m above sea level.<ref>[http://www.kreis-offenbach.de/ Homepage of the Offenbach Rural District], looked up on 22 January 2010, German.</ref> It is a mostly plain area with only a few hills. The district is southwest of the river ''Main''. The municipalities ''Mainhausen'' and ''Hainburg'' and the cities ''Seligenstadt'' and ''Mühlheim'' are near the river. There are two [[creek]]s, the [[Rodau]] and the [[Bieber]] running from south to north through the district. They are flowing to the river ''Main''. About 35 to 20 million years ago in the age of [[tertiary]] the whole region was lying under sea level. At that time it was covered by an ocean which was warm and not very deep. Lots of [[sediment]]s sank to its