The Ameisenberg is a gently conical, 581 m high, completely forested mountain. It rises on the northern edge of the Zittauer Gebirge and forms the border between Olbersdorf and the spa town of Oybin. While it drops steeply to the east, it extends to the northwest for a considerable length towards Mount Oybin. On its steeply sloping east side is the entrance to the Oybin valley, a deep valley cut to Mount Töpfer. In this valley, the tracks of the steam-powered Zittauer Schmalspurbahn (narrow-gauge railway) to the spa town of Oybin and the road from Olbersdorf to the spa town of Oybin run. The Zittauer Schmalspurbahn stop (Teufelsmühle) located in the valley floor provides a starting point for climbing the mountain. Other paths from Olbersdorf, Oybin, or Hain lead to the summit of the Ameisenberg. An old trade route called the 'Alte Leipaer Straße' runs on the west side of the mountain. The historic trade route once connected Zittau with the Bohemian town of Ceska Lipa (German: Böhmisch Leipa). On it, on the northwest side of the mountain, is the spring called 'Hungerbrunnen.' Numerous sandstone formations, especially on the east side and the summit area, such as the Robertfelsen, Bastei, or Wilde Mauer, characterize this mountain. The Ameisenberg is occasionally closed to hikers and climbers (January to August) due to being designated as a nesting protection zone.