For what it's worth, the actual search backend seems to be implemented in the separate "GeoData" extension: https://www.mediawiki.org/wiki/Extension:GeoData
replyThat extension exposes a public API that allows setting any search radius up to 10 km ( https://en.wikipedia.org/w/api.php?action=help&modules=query... ), so presumably there's no barrier to making the search radius smaller, but maybe there'd be performance issues if you allowed making it larger.
(NearbyPages just embeds a Vue app into the page that makes a client-side fetch() call to invoke that API with a hard-coded radius.)
The Special:Nearby feature seems to support changing the language. nearbywiki.org is just English while the OP has a language switch but it's limited.
replyNow I'm not sure if switching the language pulls in more results or just changes the article language...
When you change the language you are essentially moving to a different Wikipedia site, so yes it does - it pulls the results from the local site you are on.
replyOk so in theory you'll get the best results on Wikipedia in the local language... if the locals have bothered to fill in Wikipedia.
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