Yes. You have to go inland to get between the two by land.

This may be a flaw -- or may not. By sheer accident, I read once that much of the coal for the battlecruiser "Goeben" in World War I came from the Trebizond area. Something as bulky as coal had to come by sea anyway, but lots of other coastal shipping was present too because the terrain was so difficult. The Russian navy frequently attacked that shipping.

I'll stop rambling now, and ask somebody from Turkey or familiar with the road system that survived the Romans answer this.