Oh, neat. Looks very well-done, excellent, etc. I would posit that one should have more plains out in the east by Henua, Kythia, Brindisi, Muntab, etc... and rivers out there, too. Also, the Counterweight Continent and XXXX seem a little small, as does the Widdershins Ocean between XXXX and the "Main Continent".
What source did you use for the map? There's a great map in the GURPS Discworld book. My scanner's broken, but I might be able to borrow a friend's tonight if you'd like me to scan it.