– How do countries stop people from other countries entering theirs through the mountains, forests or water in the border?

Question

– How do countries stop people from other countries entering theirs through the mountains, forests or water in the border?

In: 560

Answer 1

This makes me wonder what would happen if I were to have a vacation in Japan. But I somehow miss my flight back to the US and don’t have money to book another flight back. Would Japan just deport me then?