Where was Heimat trilogy filmed?
1984-2004 Three films directed by Edgar Reitz
Heimat trilogy (1984–) was filmed in Woppenroth and Gehlweiler, 2 places named in its Wikipedia article, in Germany. 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 2 places. Each links to the sentence that says so.

