Occurrence of Attributes in Original Text

The text related to the cultural heritage 'Škocjan Caves' has mentioned 'Protected area' in the following places:
Occurrence Sentence Text Source
The protected area of 413 ha conserves an exceptional limestone cave system which comprises one of the world's largest known underground river canyons, that was cut into the limestone bedrock by the Reka River.
Discovered in 1815, the protected area in its current extension was only established in 1990, following earlier designation of roughly half the area as a Natural Monument.
Tourism and recreational activities require careful planning, control and impact monitoring in light of the limited overall size of the protected area, the localized concentration of access and the fragility of some of its attractions.
As is common in protected area management, threats do not all stem from within the regional park, thus suggesting the need to take into account the broader landscape.