Where was Frozen Planet filmed?
2011 British documentary series
Frozen Planet (2011–) was filmed in Hay River and Hay River, 2 places named in its Wikipedia article's Filming section, in Canada. 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.
Places per Wikipedia's Filming section
Wikipedia’s Filming section names 2 places. Each links to the sentence that says so.

