Todd Knarr on Nostr: Usually whatever the government of the relevant country says they are for that ...

Usually whatever the government of the relevant country says they are for that country. So, for the US, it's the USGS. For Canada it's the Canadian Geographic Names Database (CGNDB). Where there's overlap and the user is in either country, I'd expect the ambiguity to be resolved in favor of the country the user's in. If the user's not in either, I'd expect resolution to favor the country they were asking about (if any).