Primeval Beech Forests of the Carpathians is a transnational composite nature site that includes 10 separate massifs located along the 185 km (115 mi) long axis from the Rakhiv mountains and Chornohora ridge in Ukraine over the Poloniny Ridge (Slovakia) to the Vihorlat Mountains in Slovakia.
The site covers a total area of 77,971.6 ha (192,672 acres), out of which only 29,278.9 ha (72,350 acres) are part of the actual preserved area, while the rest is considered a “buffer zone”. Primeval Beech Forests of the Carpathians cover areas of Zakarpattia and Presov Regions. Over 70% of the site is located in Ukraine. The area includes two national parks, a biosphere reserve, and few habitat controlled areas (mostly in Slovakia). The both national parks along with the neighboring Poland compose a separate biosphere reserve, the East Carpathian Biosphere Reserve.
Besides Havešová, Rožok, and Stužica (all of them being located in Bukovské vrchy) there is a fourth component situated in Slovakia, namely Kyjovský prales of Vihorlat.
Ukrainian locations include Chornohora, Kuziy-Trybushany, Maramarosh, Stuzhytsia–Uzhok, Svydovets, and Uholka–Shyrikyi Luh. However, only few of ten components are accessible for visitors. Stužica is for example the only one of three locations in Bukovske vrchy (Slovakia) with available hiking trails.
Most of the Slovak components of the world heritage site are situated in the Poloniny National Park at the easternmost and also the least populated part of the country. National Park was created on 1 October 1997 with a protected area of 298.05 km² and a buffer zone of 109.73 km².