Burial sites are frequently found in the context of wetland and underwater sites due to the favourable anaerobic preservation conditions. The type of burial sites can vary, depending on the period and context.
Ship burials are frequent for the Iron Age and the Viking Age, but present throughout history. They can occur in a mound or in a bog.
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Tombs can be also located under water, if the coastline was subject to flooding. A Neolithic tomb under water is known at the shoal Schwarzer Grund in the eastern part of Schleswig-Holstein, which once formed a headland before it became inundated as a consequence of the Littorina Transgression and the post-glacial rebound.