Alsterfleet, Canal and heritage monument in Hamburg-Altstadt, Germany.

Alsterfleet is a water canal running through central Hamburg that links the harbor to the Alster River, passing between old buildings and beneath numerous bridges. The water is lined with building facades that shape the canal's appearance and define its character.

The canal was created as part of medieval urban development to move goods between major waterways. This historical connection shaped Hamburg's growth as a trading city across the centuries.

The Alsterfleet is the only continuously navigable link between the Alster and the Elbe. Its name comes from the Alster river, and the water level is regulated mainly at night, dropping about 10 cm. Since 2003 a walking path runs along the canal, passing the Alsterarkaden arcades and the Neuer Wall shopping street.

The water is accessible from paved walkways along the edges where you can stroll at your own pace, while viewing spots let you watch the water and surrounding buildings. In warmer months, boats run regularly through the canal giving you another way to see the area.

The Alsterfleet is not tidal: two locks, the Rathausschleuse and the Schaartorschleuse, hold the Alster level. Because little water is released by day, the level is regulated mainly at night and drops about 10 cm on average, producing strong currents that keep fish and mussels from settling. A fish ladder at the Rathausschleuse, installed in 2014, lets fish climb from the Elbe into the Alster.