How big is the Map of Runeterra

I have 0 clue about the length of the full map of Runeterra. there was a message from a guy named RiotArkem who brought his own prediction about how far the travel would be from one area to the next, which maybe accurate, except i didn't see the two location it was given to us. On top of the fact that he wasnt part of the team that made the map, and research it through other references not Riots version of the map. Would there be anyone who can shed some enlightenment to this subject?

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