Where was Hell in the Pacific filmed?
1968 film by John Boorman
Hell in the Pacific (1968) was filmed in Rock Islands, 1 place named in its Wikipedia article's Production and release section, in Palau. 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 Production and release section
Wikipedia’s Production and release section names 1 place. Each links to the sentence that says so.
Recorded only at country level
Its Wikipedia article also says it was filmed in Philippines, without naming a place, so it is not on the map.