Šibeničník, Nature reserve in Mikulov, Czech Republic.

Šibeničník is a 3.38-hectare nature reserve on two limestone hills about two kilometres south of Mikulov, the northern summit reaching 238 m. The upper slopes are open grass steppe with scattered limestone outcrops, while the foot of the hills is wooded; a large fishpond, the Šibeník, lies to the southwest.

The area was placed under protection in 1946, marking the start of systematic preservation efforts in the region. This early recognition of its ecological value enabled decades of conservation management.

The name Šibeničník means "gallows hill", and the German name Galgenberg has the same meaning. The hill's rare steppe oat was found on 28 May 1912 by botanist Josef Podpěra. After Austrian botanists August Ginzberger and Alois Teyber persuaded mayor Alois Winter of its value, the Mikulov council stopped afforestation on 21 November 1912.

The area is best reached on foot through marked hiking trails departing from Mikulov. Spring and early summer offer the best opportunity to experience the landscape and plant life in full growth.

On 28 May 1912 the botanist Josef Podpěra found the steppe oat grass Helictotrichon desertorum subsp. basalticum on the western slope of the northern hill; it is the only site of this grass in Moravia. Reforestation with red pines and ashes nearly destroyed it until the Nikolsburg council halted planting on 21 November 1912.