Location of the Backnang Bay
As Backnanger bay the northeastern bulge of is natural space Neckarbecken in Baden-Wuerttemberg referred to the eponymous town in the center of Backnang is. The Backnang Bay is the natural sub- unit No. 123.3 of the main unit group Neckar- and Tauber-Gäuplatten .
The Backnang Bay is surrounded by the Swabian-Franconian Forest in a semicircle from north to east to south-east , with the Löwenstein Mountains in the north, the Murrhardt Forest in the northeast, the Welzheimer Forest in the east and the Berglen in the southeast.
The area is traversed in its center in a south to west direction by the Murr , which drains the entire bay. The central town, the city of Backnang, is also located on the Murr. To the east and south-east of it, i.e. to the left of the Murr, lies the sub-area of the Weissach Valley, named after a tributary of the Murr, with the communities Weissach im Tal , Allmersbach im Tal and Auenwald . The districts of the municipality of Aspach occupy the north-west of the bay on the other side of the Murr . In the north of Backnang, the bay extends up the Murra to Oppenweiler . The general usage also includes the communities of Kirchberg an der Murr and Burgstetten further south-west and downstream of the Backnang Bay. From the geological point of view , which distinguishes between the outer and inner Backnanger Bay , parts of the municipal areas of Winnenden , Leutenbach and Affalterbach also belong to it.
The Backnang Bay was created by reversing the relief from a bulge in the earth's crust in the area of the so-called Backnanger Saddle . The layers of the earth were raised here by up to 100 meters compared to the surroundings, which is why the Keuper layers here were increasingly removed. After the harder layers of the silica sandstone and the reed sandstone had been eroded once, the softer layers of the gypsum and Lettenkeupers were cleared over a large area. The erosion only encountered greater resistance again, where the very erosion-resistant layers of the Upper Muschelkalk , which lie underneath , were reached. During the Ice Ages , a layer of blown loess was deposited over the remaining plaster and Lettenkeuper surfaces.
The Backnang Bay is included in the gau landscapes of Baden-Württemberg. As a result of its deep deepening, the Murr and the lower reaches of its tributaries run in the Muschelkalk and have formed strong loops in it, the Murr sinks from about 250 to a. The loess areas used for agriculture are on average around height; Where the loess was washed away, however, orchards and grassland dominate the landscape. On the surrounding Keuper Mountains, which on the edge of the bay up to heights of 400 to above , stands against it forest.