I never said it was, but not everything needs to be completely unique. Miles might sound a bit modern for a fantasy series but leagues is an easy to grasp measure of distance which has that medieval feel. Personally I'd advise against making up your own measurements unless the culture that uses them is truly very strange or unusual. I'd rather a fantasy author measured distances in miles or leagues than say Zanthums or some other made up unit. I can grasp what the former two actually mean so when I'm told there's a thousand leagues of desert between point A and B, I can think wow, that's a lot of desert these guys have got to cross. Tell me there's a thousand Zanthums of desert and I won't have a clue. When it comes to little things like this I'm more likely to sigh at the author for trying to be a special snowflake rather than praising their originality. There are more important things to be doing imo.

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