The United Nations Educational, Scientific and Cultural Organization (UNESCO) has designated 31 World Heritage Sites in seven countries (also called "state parties") of Southeast Asia: Thailand,Laos, Cambodia, Vietnam, Malaysia, Philippines and Indonesia. Four states in the region do not have any World Heritage Site: Burma, Brunei, Singapore and East Timo r
Indonesia and Vietnam lead this list with seven inscribed sites each. The first sites from the region were known at the 15th session of the World Heritage Committee in 1991. Each year, UNESCO's World Heritage Committee may
inscribe new sites on the list, or delist sites that that no longer meet the criteria. Selection is based on ten criteria: six for cultural heritage(i–vi) and four for natural heritage (vii–x).. Some sites, designated "mixed sites," represent both cultural and natural heritage. In Southeast Asia, there are 19 cultural, 12 natural, and no mixed sites.
The World Heritage Committee may also specify that a site is endangered,
citing "conditions which threaten the very characteristics for which a property
was inscribed on the World Heritage List". Two sites in this region, Tropical
Rainforest Heritage of Sumatraand Rice Terraces of the Philippine Cordilleras are presently listed as endangered, and one site, Angkor, was previously listed but lost that status in 2004.