Occurrence of Attributes in Original Text

The text related to the cultural heritage 'Brimstone Hill Fortress National Park' has mentioned 'Buffer zone' in the following places:
Occurrence Sentence Text Source
The entire site covers approximately 15 hectares surrounded by a 1.6 km (1 mile) buffer zone.
Protection of the site is further assured by the National Physical Development Act (2000) which also defines a buffer zone of 1.6 km around the base of the hill.