Map file editing (errors in Zen's Europe)

[Foom]

I'm close to starting a multiplayer game on Zen's Europe map, downloaded from Arryn's site (thanks Arryn!)

I started a test game with the corrected map file from tinkthank, found on the same page. The strange thing is that the provinces "Eastern Mediterranean" (20) and "Gulf of Gabes" (9) are marked as plains types, but they look underwater to me.

Now I'm guessing I can just change the terrain types for those two provinces, e.g.

Code:

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#landname 9 "Gulf of Gabes"

#terrain 9 0

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.. becomes ..
Code:

---

#landname 9 "Gulf of Gabes"

#terrain 9 5

---

.. but I wanted to ask before we start a multi game that crashes around turn 50 because I screwed up the map file.

Also, is there a map making guide somewhere? Google and forum search didn't yield any results other than a map making guide for Dom1.