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 lake has an area of 0.2 square kilometres.
Wikipedia https://en.wikipedia.org/wiki/Binnenalster
Address Hamburg 20354, Germany
Coordinates 53°33'18.225" N 9°59'43.598" E