Rain (also: Rain (Lech)) is a municipality in the Donau-Ries district, in Bavaria, Germany. It is situated on the river Lech, close to its confluence with the Danube, 11 km east of Donauwörth.Rain is on the B16 road and served by the Danube Valley Railway (Donautalbahn), both of which run between Ulm and Regensburg.The earliest reference to Rain is in a document of the Niederschönenfeld monastery dated 4 July 1257, wherein it is described as a "civitas nostra" or ducal town.