Where was Once Upon a Time in Tibet filmed?

2010 film by Dai Wei

Once Upon a Time in Tibet (2010) was filmed in Namtso and Nagqu, 2 places named in its Wikipedia article's Production section, in China. Wikidata records no filming location for it at all, so the article is the only recorded source. Each place says where its claim comes from.

See them on the map → Wikipedia Source data

Places per Wikipedia's Production section

Wikipedia’s Production section names 2 places. Each links to the sentence that says so.