Where was Flood! filmed?
1976 film by Earl Bellamy
Flood! (1976) was filmed in Brownsville and Fall Creek Lake, 2 places named in its Wikipedia article's Production section, in the United States. 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 section
Wikipedia’s Production section names 2 places. Each links to the sentence that says so.
