Where was Magnificent Obsession filmed?

1954 film by Douglas Sirk

Magnificent Obsession (1954) was filmed in Lake Tahoe, Big Bear Lake, Venice, San Bernardino National Forest and Lake Arrowhead Reservoir, 5 places named in its Wikipedia article, in the United States. Wikidata itself records the shoot only as California. 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 5 places. Each links to the sentence that says so.

Recorded only at country level

Also filmed in California, but the exact places are not known, so they are not on the map.

Filming locations that are mapped there: United States

Also shot in these places