Occurrence of Attributes in Original Text

The text related to the cultural heritage 'Jeju Volcanic Island and Lava Tubes' has mentioned 'UNESCO World Heritage Sites' in the following places:

Occurrence Sentence	Text Source
[1] It was inscribed as one of the UNESCO World Heritage Sites in 2007 because of the Geomunoreum Lava Tube System and the exhibition of diverse and accessible volcanic features which are considered to demonstrate a distinctive and valuable contribution to the understanding of global volcanism.	WIKI