I tried it with a heavily distorted low-res screenshot from one of my Insta 360 videos of backcountry Portugal. You basically see a dirt road from above and a heavily distorted small strip of a hint of the ocean on the side - nothing more.

That it guessed this one correctly is a miracle to me.

Then I tried it with a photo of an abandoned structure in rural France and it guessed UK because some words in a visible Graffiti were in English.

So, it is hit and miss.

I gave it a selfie from the middle of some forest in Yellowstone and it nailed it. No signs or anything obvious, just a bunch of trees (also scrubbed EXIF).

I gave it a much harder photo from the Borrego Badlands, and it got SoCal, but was 200mi off.

I tried some old phone photos from my grandparent's rural Canadian farm and it either got the province wrong or it guessed Montana or North Dakota.

When I show it random shots of mountainous jungle terrain from my patio (the view is long, maybe 20km in total…) if gets my location within 10-50km consistently.

there are services for photo sharing with location data (panoramio for example) that could be used for training.