Binnenalster or Inner Alster Lake is one of two artificial lakes within the city limits of Hamburg, Germany, which are formed by the river Alster . The main annual festival is the Alstervergnügen.
The phrase "inner" refers to the old city walls of Hamburg. The Binnenalster was the part of the lake that was "inside" the city walls. The lake was originally created to serve as a reservoir for a mill. As of 2008 the old city walls do not exist, instead two car and train bridges, the Lombardsbrücke and the Kennedybrücke, span the river.
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