This symbol is not shown in the map legend. All these tumulii are mounds of earth, but many of them are weathered and flat. In fact, just a few of these tumulii have been restored and may be recognized by the public as ancient monuments. 

This symbol can confuse visitors to the wood. The symbol should be shown in the map legend, or the symbols marking an unrecognizable tumulus should be removed. Their (dubious) location is given on https://sdfikort.dk/spatialmap