Baumwerder is an uninhabited island, approximately 2 hectares in area, in the Breitling facing a bay.

The flat bodden island is approximately 325 metres long and 135 metres wide.

It is shaped like a triangle with a larger indentation on its north side.

Numerous species of bird breed on the island, including merganser (Mergus serrator), gadwall (Anas strepera) and shelduck (Tadorna tadorna).

[1] Baumwerder is part of the Special Area of Conservation known as Wismar Bay and the bird reserve of "Wismar Bay and Salzhaff".