Flehmüller's oak (also Flohmüller's oak, or simply called thick oak) is one of the oldest natural monuments in the district of Nordhausen and has a landscape character with about 600 to 1000 years. The 20-meter-high free-standing pedunculate oak (Quercus robur) is located on the Liethberg above Krimderode, a flat table mountain of 220 meters in height. The oak has a massive, strong roots attached trunk, the branches strive obliquely and expansive upwards. The treetop has a diameter of 20 meters, the trunk circumference is 7.17 meters. In 2015, the breast height was 7.25 meters, at a height of 21 meters.
In 1935, the oak was entered in the Natural Monument Index.
Below the mountain on which the oak stands, the Zorge flows. In snowy winters or storms, she turned into a raging river and flooded the adjacent fields and homesteads. According to legend, the miller living there, probably an ancestor of the gypsum mill Steuerlein, climbed the mountain. He "implored" the gods to avert the evil of his fields and his court. Out of gratitude that he, his family, and his mill were spared disaster, he planted this oak on the mountain.
Source: NordhausenWiki