First reported 1711 Ludolph Smids Schatkamer der Nederlandsse Oudheiden
Hugging a large old birch tree, D21, though not large, is notable both for its idyllic location in a grove of trees on the edge of the Zuid-es outside Bronneger, and for the many important finds unearthed here. Many Funnelbeaker pots, tools and remains of hundreds of burials have been found here. It is one of the group of five hunebedden formed by the twins D21 and D22 and the triplets D23, 24 and 25 that lie in the nearby bush.