Where was The Sea Lion filmed?
1921 film by Rowland V. Lee
The Sea Lion (1921) was filmed in Orange County and Balboa Peninsula, 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.
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Towns & cities
Orange County
United States
County in California, United States
“Scenes were filmed aboard the Fox, which was anchored off Balboa in Orange County.” Wikipedia
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Landscapes & nature
Balboa Peninsula
United States
Neighborhood of Newport Beach, California