Home of the Plain of Jars, a UNESCO World Heritage site (4)

I believe the answer is:

laos

(Other definitions for laos that I've seen before include "Landlocked state in southeastern Asia" , "Indo-Chinese country" , "Asian country, capital Vientiane" , "South-east Asian republic, capital Vientiane" , "part of Asia" .)

I've seen this clue in The New York Times.

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