Mustavuori nature reserve and fortification
Mustavuori is included in the Herb-Rich Forest Conservation Programme and the European Nature 2000 network.
The flora of the herb-rich forest of Mustavuori is very diverse, owing to the fact that the area's bedrock is rich in minerals that benefit demanding plant species. The excavations conducted in connection with the building of the area's fortifications have also released calcium and other nutrients into the soil.
The bedrock in the centre of Mustavuori features First World War era trenches and three large excavated caves.
The herb-rich forests of Mustavuori house a variety of singing bird species, including wood warblers, icterine warblers and Eurasian blackcaps. The woods, which have been allowed to develop in their natural state, also house red-breasted flycatchers, hazel grouse and black grouse. These kinds of forests also accumulate plenty of decaying wood, the presence of which is essential for a range of different species, including polypores. As such, the area features a broad range of polypores, including some rare species, such as Anomoporia kamtschatica and Antrodia pulvinascens.