The site of community importance ROSCI0023 Cascada Mişina together with the nature reserve 2.818 Cascada Mişina are located in the upper basin of Mişina stream, an affluent of Năruja river, on the administrative territory of Nistoreşti commune. The site area is of 220 ha, plus the nature reserve area of 189,7 ha.
The access to the site can be made on the county road DJ 205D, which then continues with a forest road through Cheile Nărujei, along Bălosu stream.
The landforms of the region are influenced by the powerful tectonic processes of the past, thanks to which, in an area marked by overthrust and an inversed tectonic fissure, Cascada Mișina was born, with a height of over 12 m. The upper section of Mişina stream is a natural amphitheater open to the north, closed by the semi-circle formed by the peaks Pietrosu, Plaiul Căşăriei, Culmea Mărului, Zboina Frumoasă and Culmea Înțărcătoarea.
The geology of the region is characterized by the specific complexity of the whole flysch area from the Curvature Carpathians. The geological structure is dominated by the deposits of Pânza de Tarcău, meaning alternations of sandstone, marl and clay, with slate sandstone limestone insertions, marl-chalk, conglomerates and Kliwa sandstone, as well as bituminous flysch, highly diversified and fractured in fissures, of which Zăbala fissure seems to be a continuation of Focșani – Nămoloasa – Galați – Tulcea fissure.
In this entire mountain region made up of rigid or semi-rigid rocks, with low permeability, the infiltration is reduced and the precipitation easily drains from the slopes and flows into the rivers. At the same time, because of its resistance, this type of rock is an alluvium control factor. The main hydrographic artery of the area is Mișina stream. Within the natural reserve, formed by the joining of Făgetu Rotund and Turcu streams, it receives on the right side Coada Boului and Boului streams. The total length of the surface hydrographic network overlapping the protected area is 3.6 km.
The territory of Vrancea County is characterized by a temperate continental climate, with great variations from winter to summer and with pronounced Eastern and Nordic influences which increase extreme phenomena. The thermic regime is influenced by altitude and by the vegetation coverage degree of the land (in the forested parts of the mountain, the extremes are toned down and the amplitudes are smaller, compared to the area of the upper slope covered with mountain detritus), as well as by the orientation, nebulosity and wind regime.
The most widespread soils in the area are the brown-acid type. The natural vegetation above these soils is dominated by beech forests mixed with conifers in lower altitudes and spruce forests in high altitudes. Also in high altitudes, there are brown-acid soils of meadows with podsols, even dark brown-acid soils here and there. Above 1400 m altitude, soils of the spodosolus class are predominant, on which mainly grasslands develop.