Somebody with experience, do me a favor. I'm trying to learn to eyeball the speed killing effect of mountains. Check out a random example of a "what would you do":
Find New Almerra Castle, owned by HoC - the southwestern-most castle on plains side of the plains/desert boarder, by the sea - affectionately called Almerica by the Hounds, I believe. If a trader were there, for example, and wanted to get to Nova Sharmish (nearby to the north-east), would it be faster to cross that wee little stretch of mountains, or to walk all the way around to the north, and loop back down south-east?