Celle is a town and capital of the district of Celle in Lower Saxony, in north-central Germany. The town is situated on the banks of the river Aller, a tributary of the Weser, and has a population of about 71,000. Celle is the southern gateway to the Lüneburg Heath, has a castle built in the Renaissance and Baroque styles and a picturesque old town centre with more than 400 timber-framed houses, making Celle one of the most remarkable members of the German Timber-Frame Road. From 1378 to 1705 Celle was the official residence of the Lüneburg branch of the dukes of Brunswick-Lüneburg, who had been banished from their original ducal seat by its townsfolk.

The Aller is a 215-kilometre-long (134 mi) river in the states of Saxony-Anhalt and Lower Saxony in Germany. It is a right-hand, and hence eastern, tributary of the Weser and is also its largest tributary. Its last 117 kilometres (73 mi) form the Lower Aller federal waterway. The Aller was extensively straightened, widened and, in places, dyked, during the 1960s to provide flood control of the river. In a 20-kilometre-long (12 mi) section near Gifhorn, the river meanders in its natural river bed.