The Tectonic Arena Sardona stretches from 520 m above sea level (a.s.l.) eastwards from Ennenda to the Ringelspitz 3247 m a.s.l. Due to different elevations, various climatic and topographic relations and the various geologic substrata, the region features a large diversity in natural habitats. For a northern Alpine region, the estimated 800 different plant species represent a high degree of species diversity.
Lower-lying areas are largely covered by forest communities, with beech-silver fir and spruce forests being the most common. Of particular interest are various forests on unusual sites, e.g. mountain pine on limestone or wetland soils. A notable feature is the occurrence of arolla pine (Pinus cembra) at higher altitudes in the Calfeisen, Murg and Mürtschen valleys; these are the northernmost examples of extensive stands in the whole of Central Europe.
The subalpine alluvial forests in the Chrauchtal (of national importance) and in the Calfeisental are also of particular landscape value. Above the treeline, mountain pastures with mat-grass swards and dwarf shrub heath predominate up to an altitude of approx. 2200 m a.s.l. Higher up, areas free of rocks and debris are covered by alpine swards.
Ground water levels control formation of low alpine fens (marshes) as, for example, in Chrauchtal. In contrast, high alpine fens, such as in Murgtal or Mürtschental are supplied only through rainwater and therefore acidic and nutrient-poor. One plant that has adapted to these meagre conditions is the carnivorous round-leaf sundew.
The World Heritage Site is an important natural habitat for mammals such as the Alpine ibex (Capra ibex), red deer (Cervus elaphus), chamois (Rupicapra rupicapra), deer (Capreolus capreolus), fox (Vulpes vulpes), marmot (Marmota marmota) and birds like black grouse (Tetrao tetrix) or rock ptarmigan (Lagopus muta) (snow chicken). Within the world heritage, 80 to 90 species of breeding birds can be found. Various amphibians and reptiles are found even in the highest-lying areas of the property. Around 90 butterfly species have been recorded. On account of its diverse habitats, the property is of major significance for subalpine and alpine insect species.