Occurrence of Attributes in Original Text

The text related to the cultural heritage 'Namib Sand Sea' has mentioned 'UNESCO World Heritage' in the following places:
Occurrence Sentence Text Source
NamibAn image of the Namib Desert by the MODIS instrumentApproximate boundaries of the Namib DesertLength1,600xc2xa0km (990xc2xa0mi)Width50xe2x80x93160xc2xa0km (31xe2x80x9399xc2xa0mi)Area160,000xc2xa0km2 (62,000xc2xa0sqxc2xa0mi)GeographyCountriesNamibia, South Africa and AngolaRivers List Swakop RiverKuiseb RiverCunene RiverOrange RiverOlifants RiverTsauchab UNESCO World Heritage SiteOfficialxc2xa0nameNamib Sand SeaCriteriaNatural: vii, viii, ix, xReference1430Inscription2013 (37th session)Area3,077,700 haBufferxc2xa0zone899,500 ha