As a huge geography nerd, I really enjoyed this, thanks for making it!
The only issue I have is with the Bering Strait. I accepted the mission to get there while I was on the south pacific ocean, so naturally I went east towards the end of Russia, only to realize the trigger was in North America. It would be so cool if you could wrap your world on a sphere, that would solve the problem!
For reference, there's that guy who made a similar game with a round world, you might want to check it out:
Overall, I loved the game, it's very nicely done and I loved the dialogues, the 3d models and the ability to take pictures.
Great job!