So I just learned that not all borders are fenced, very few of them are actually. So how are countries able to monitor thousands of kilometers of unfenced borders to fight off smuggling and illegal immigration ? Especially when it comes to long borders in arid/undeveloped areas, one example that comes to mind are the borders in Siberia.
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Don’t underestimate the fact that a lot of times, there is a natural border in place, like a river or a mountain range, with specific crossings that can be guarded
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