Together with the Breiteberg and the Steinberg, the Seidelsberg belongs to a group of three phonolite peaks. In the upper area of the wooded knoll there are rock formations and a scattering of blocks. There is a spruce coniferous forest on the north-northeast side of the hilltop. The south-southwest side is covered with a deciduous forest that used to be a farmer's forest. The deciduous forest with a shrub layer of hazel, hawthorn and mountain ash is an FFH habitat type of bedstraw-oak-hornbeam forest. On the Seidelberg u. a. the greater mouse-eared bat and the terrier's bat can be found.
The summit of the Seidelsberg consists of rocky cliffs and offers no view because of the high forest. From the slopes below the summit there is an unobstructed view over the Zittau Basin to the Iser and Jeschkengebirge to the east and south-east. On the western slope, the Oberlausitzer Ringweg leads from the Breiteberg to the Butte.
The Seidelsberg is part of the 21.9 ha FFH area "Basalt and phonolite peaks of eastern Upper Lusatia".
Source: Wikipedia
Through the opening in the rock you can admire a special play of light at sunrise on the winter solstice.