Occurrence of Attributes in Original Text

The text related to the cultural heritage 'Putorana Plateau' has mentioned 'Buffer zone' in the following places:
Occurrence Sentence Text Source
The Putorana Nature Reserve, established in 1988 and administered from Norilsk, is a protected area covering some 1,887,251xc2xa0ha (4,663,500 acres) with a buffer zone of 1,773,300xc2xa0ha (4,382,000 acres).
The property is large and is surrounded by an extensive buffer zone of 1,773,300 ha.
Difficult access is also a contributor to the propertyxe2x80x99s integrity: there are no roads within the property and large parts of the buffer zone, thus the property is only accessible by helicopter or boat.
Important natural values linked to the property are located in the buffer zone, and their conservation is also an essential requirement.
Increasing tourism in the buffer zone carries the risk of unauthorized access to the property, including for hunting and fishing.
There is a need for unambiguous and rigorously enforced land use and building arrangements in the buffer zone and for regulations of tourism, including strict limits on air traffic.