Cuatro Mesas? Four tables? Weird name for a map xP
"Mesa" can mean an elevated piece of land with cliffs on some or all sides. Similar words are "butte" and "plateau". Unless you were being weirdly sarcastic or something, in which case oh well.
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@ the map, only major thing I would change are the watchtowers. It's not much fun (imo) if the watchtowers cover 100% of the possible attack routes (at least it looks like they do, maybe I'm wrong). I think someone already touched on this earlier but thought I would mention it as well.