But since there are probably natives there, never mind the animals (do animal thoughts count for the cognitive?), there is thought and it will exist no matter what other people don't know about. It's not about global public opinion, it's about whether or not there are thoughts happening in that place.
So if an Elsecaller was on Alaska in the Cognitive and traveled west they would end up in a different world (let's say Scadrial) and not Russia, but if they transferred to the Physical first they would end up in Russia? And what if they went back to the Cognitive in Russia and travelled east, would they end up somewhere else entirely (not earth or Scadrial)?
Because what essentially you are saying is that the earth is round but the Cognitive Realm isn't, which is a contradiction. since in the Physical you have 55 miles of water between Alaska and Russia. While in the Cognitive Realm you have entire worlds on either end and the ends don't ever actually meet.
Furthermore who decided the "end of the world" is there and not in some other arbitrary place?