This is Han÷ Bay

Han÷ Bay, part of the southern Baltic Sea outside the coasts of Blekinge and Scania in Sweden and north of the Danish island of Bornholm. The bay is rather shallow, with its largest depth of more than 60 m (200 ft) close to the Bornholm Basin.
Salinity varies between 7.5 in the surface water to 13 parts per mille deeper down.
Upwelling of deep water makes the coastal (bathing) water cold during winds from south to west.
Fishing of herring, eel and cod is important.
The bay suffers from pollution from the rather densely populated areas around the bay, with heavy traffic, modern agriculture and several polluting industries.

The map shows the Han÷ Bay divided in areas suggested by the Swedish Meteorological and Hydrological Institute. The terrestrial borders in red are between larger watersheds.