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Lots and lots and lots and lots and lots and lots of mountains. Prior to the invention of flight, mountains were often more than a little bit annoying to cross. Passes make traversing a mountain r...
Answer
#1: Attribution notice removed
by
System
·
2020-06-01T14:13:48Z (over 4 years ago)
Source: https://worldbuilding.stackexchange.com/a/35290 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/