First reported 1711 Ludolph Smids Schatkamer der Nederlandsse Oudheiden
D20, which sits in a large field at the edge of the bush with its smaller twin D19, is impressive in its size as well as for its original ringstones. It presents a rather complete picture of hunebed construction. While many sites have placeholder stones where the ringstones were, here they were found still intact. This site gives its name to a key pottery style in the archaeological record, Drouwen ware.