The section of the Alster from Ohlsdorf to the confluence with the Outer Alster is sometimes referred to as Streek (Low German for area) or Alsterstreek.
The course is artificially straightened in this section of the river.
The old course of the river led through the Ring Canal, Braband Canal and Leinpfad Canal.
At the same time, the Skagerrak Canal and the Island Canal lead south.
After the construction of the Fuhlsbüttler lock (1913, demolished in 2011, then replaced by a weir), Fritz Schumacher presented a concept for canalizing the Alster below the lock to Eppendorf.
His concept envisaged a strictly architectural framework with embankment walls, terraces and pools.
The engineering department of the city of Hamburg, on the other hand, preferred a natural version of the Alster river.
The opposing designs were controversially discussed, Schumacher's approach was well received, and his ideas were eventually partially implemented.
The Tarpenbek flows into Eppendorf and the Isebek Canal flows into it at the border with Harvestehude. The Krugkoppelbrücke finally forms the border to the Outer Alster.
(Source: Wikipedia)