Where was The Keep filmed?

1983 film by Michael Mann

The Keep (1983) was filmed in Blaenau Ffestiniog, Llanberis, Shepperton Studios and Llechwedd Slate Caverns, 4 places named in its Wikipedia article, in the United Kingdom. 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 article

The Wikipedia article names 4 places. Each links to the sentence that says so.

Also shot in these places