Yes, Orania is fine (and wrap around
).
Having only one water nation is not a big deal : many nations have amphibian access (sacred TC, Agartha, etc...) or can gain it through magic. AMOF, I am not really obsessed with balance : a perfect balance is almost impossible, anyhow, diplomatic and random events make most things unpredictable. We just have to avoid heavy unbalancing ; with the Orania map + 1 water nation, I don't think it shall be the case. And R'lyeh EA is not a very easy nation to play
