Where was A Man Called Horse filmed?
1970 film by Elliot Silverstein
Wikidata records no filming location for A Man Called Horse (1970) at all, not a place, not even a country. There is nothing to pin, and this page says so rather than guessing.
Why there is no pin
Its Wikipedia article also says it was filmed in Arizona, Durango, without naming a place, so it is not on the map.
Filming locations that are mapped there: United States · Mexico