It regulates water levels and inhibits unfavourable currents in the Copenhagen Harbour, occupying both sides of the narrow strait between Zealand and Amager.
Especially the ones in the southern part of the harbor, Islands Brygge and the areas now known as Sluseholmen and Teglholmen on the Zealand side, had led to strong currents of up to 6knots.
It is now permanently closed and with a clearance of just three metres, only smaller boats can now enter and exit Copenhagen Harbour from the[clarification needed] The lock consists of an embankment in granite with associated system.
A house of the lock keeper and another building for the engine which powered the machinery was built on a small artificial island which was established halfway along the embankment.
[2] Over the years the shallow waters along entire eastern section of the embankment have been filled, meaning that the island with the buildings now appears as an integrated part of Amager.