The long dolmen is almost 50 metres long, 12 metres wide and encircled by 47 large stones, of which the end stones are several metres high. It became a preserved area in 1809.
According to legend, the long dolmen is called Troldkirken (the Troll Church) due to the fact that a troll on the other side of the Limfjord became angry with Sønderholm, because it hated the ringing of the bells from the church and therefore threw a large stone across the fjord to destroy the tower. However, the stone did not reach the church, and instead it formed the large capstone on top of the long dolmen. This stone is said to weigh around 7000 kilos.