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How big is the ocean on the other side of the Avatar world?
We can find out how big the ocean on the backside of the Avatar world is by using these maps from LoK. According to my calculations, the backside ocean spans from about 140 degrees to 220 degrees, making it 80 degrees wide. This is about a quarter of the globe. To put this in perspective, the backside ocean would proportional be about the same size as our Pacific ocean.
Maps are from LoK S3 ep 2 & 11 respectively.