In the currently served map data(not datafile, but what loads looking at the map), there are only 17 squares with TerrainSpecificType=4, and all seem to be a specific angle of shoreline.
http://elgea.illyriad.co.uk/#/World/Map/-691/-768" rel="nofollow - http://elgea.illyriad.co.uk/#/World/Map/-691/-768 http://elgea.illyriad.co.uk/#/World/Map/-678/-778" rel="nofollow - http://elgea.illyriad.co.uk/#/World/Map/-678/-778 http://elgea.illyriad.co.uk/#/World/Map/-625/-754" rel="nofollow - http://elgea.illyriad.co.uk/#/World/Map/-625/-754 http://elgea.illyriad.co.uk/#/World/Map/-395/-634" rel="nofollow - http://elgea.illyriad.co.uk/#/World/Map/-395/-634 http://elgea.illyriad.co.uk/#/World/Map/-394/-636" rel="nofollow - http://elgea.illyriad.co.uk/#/World/Map/-394/-636 http://elgea.illyriad.co.uk/#/World/Map/-342/-650" rel="nofollow - http://elgea.illyriad.co.uk/#/World/Map/-342/-650 http://elgea.illyriad.co.uk/#/World/Map/-290/-618" rel="nofollow - http://elgea.illyriad.co.uk/#/World/Map/-290/-618 http://elgea.illyriad.co.uk/#/World/Map/-282/-651" rel="nofollow - http://elgea.illyriad.co.uk/#/World/Map/-282/-651 http://elgea.illyriad.co.uk/#/World/Map/-97/-597" rel="nofollow - http://elgea.illyriad.co.uk/#/World/Map/-97/-597 http://elgea.illyriad.co.uk/#/World/Map/-47/-664" rel="nofollow - http://elgea.illyriad.co.uk/#/World/Map/-47/-664 http://elgea.illyriad.co.uk/#/World/Map/78/-666" rel="nofollow - http://elgea.illyriad.co.uk/#/World/Map/78/-666 http://elgea.illyriad.co.uk/#/World/Map/79/-667" rel="nofollow - http://elgea.illyriad.co.uk/#/World/Map/79/-667 http://elgea.illyriad.co.uk/#/World/Map/224/-687" rel="nofollow - http://elgea.illyriad.co.uk/#/World/Map/224/-687 http://elgea.illyriad.co.uk/#/World/Map/317/-701" rel="nofollow - http://elgea.illyriad.co.uk/#/World/Map/317/-701 http://elgea.illyriad.co.uk/#/World/Map/318/-702" rel="nofollow - http://elgea.illyriad.co.uk/#/World/Map/318/-702 http://elgea.illyriad.co.uk/#/World/Map/989/-980" rel="nofollow - http://elgea.illyriad.co.uk/#/World/Map/989/-980 http://elgea.illyriad.co.uk/#/World/Map/990/-982" rel="nofollow - http://elgea.illyriad.co.uk/#/World/Map/990/-982
Here is an updated https://drive.google.com/file/d/0B-74l5hL206bZmdzSWwzNzFMdFU/edit?usp=sharing" rel="nofollow - datafile_worldmap.txt (official datafile is from 2012-04-21)
If anyone else tried to make GeoID(or X & Y) a unique key then ran into issues importing datafile_worldmap.txt, these two rows were duplicated(problem is not in my updated file).
GeoID|X|Y|Wood|Clay|Iron|Stone|Food|TerrainSpecificTypeID|TerrainCombatTypeID|RegionID 1810037|132|96|7|3|5|5|5|4|6|15 1810037|132|96|7|3|5|5|5|4|6|15 1930359|394|36|5|5|5|5|5|4|7|14 1930359|394|36|5|5|5|5|5|4|7|14
[Edit:fixed link]
|