– How do countries stop people from other countries entering theirs through the mountains, forests or water in the border?
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What the other comments said you basically just guard them by patrolling and now more commonly with small portable drones as well for harder to travel areas.
Many land borders are actually not very actively guarded because climbing over mountains and ravines isn’t that easy which is why in those areas it’s just barren or wildlife only and barely anyone lives around the border. Areas you see having border guards and customs are easier areas for people to travel which is why there is more security and often fences and walls too to prevent illegal travelling.
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