The Petersberg, at 250.4 m above sea level (NN), is the highest point in the district of Saalekreis in the German state of Saxony-Anhalt.

It was formed, like the other porphyritic domes in the surrounding area, during the Upper Carboniferous and Lower Permian by the solidification of numerous molten lava flows under the earth.

The Petersberg consists of small-grained Halle porphyry – this hard rock is used mainly as a raw material for the manufacture of ballast and gravel.

The surrounding loose rock was cleared away by the ice sheet leaving the hard porphyritic core behind.

Made of reinforced concrete, the Petersberg communication tower is 119 metres high and is now operated by Deutsche Telekom.

There is also a seven-storey A Tower on the Petersberg which also belongs to Deutsche Telekom and has directional antennas on the roof.