Where was The Drum filmed?
1938 film by Zoltan Korda
The Drum (1938) was filmed in Chitral, Harlech, Denham Film Studios and Rhinog Fawr, 4 places named in its Wikipedia article, in the United Kingdom, Pakistan. 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 article
The Wikipedia article names 4 places. Each links to the sentence that says so.
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Studios & sets
Denham Film Studios
England
British film studio
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Towns & cities Chitral
Pakistan
Town in Khyber Pakhtunkhwa, Pakistan
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Landscapes & nature
Rhinog Fawr
Wales
Mountain (720m) in Gwynedd
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Towns & cities
Harlech
Wales
Town, community and seaside resort in Gwynedd, within the historical boundaries of Meirionnydd in northwest Wales