Huh? That isn't supposed to happen. Are you sure there isn't any land that can access the NW?
We have this check:
Code:
-- Check the location is a decent city site, otherwise the wonderID is pointless
local plot = Map.GetPlot(x, y);
if self:Plot_GetFertilityInRange(plot, 3) < 16 then
return false
end
Each coast tile is 1 fertility (resources are added later), and fertility of each plot is divided by the distance from the NW before being added to the total, so there's no way it can exceed 16 fertility.
EDIT: Wait atolls are 5 fertility each and added before NWs... Guess I should just increase the threshold.