291 provinces, 226 of these are land and 65 are under water.
I was getting anxious to try out the Dom3 random map generator and then Gandalf uploaded an 1100 province generated map. So of course I did a quick trim and conversion so that I could play on it while I wait for October.
Basically just used the map image with some modifications and adjustments due to trimming the province count down. This meant manually assigning neighbors, so I was on my own as far as the handling of mountains. As it is, mountains act as unpassable borders and I tried to keep it to one terrain per province.
Of special note:
There are only two start locations set, both for water nations with one being centered in each "pond". The rest of the nations start locations are assigned by the game. I also set all of the edge provinces to nostart to minimize poor start locations.
Currently I am having a blast playing as Atlantis on this map. Originally I intended to have the waterway between the two ponds to allow movement between ponds, but I accidentally left the connection out. Now that I am playing it, I am glad that I left it out. It has forced me to maintain a beachhead on land to assault Rlyeh. (Thematically, the explanation is that the deep currents are too strong to allow passage of troops from one pond to another without crossing land.)
Update: 6.01
Found a sea province that was missed. Very disturbing for my Atlantians to suddenly find themselves fighting Rlyeh on a grassy plain.