Down under there is a jungle hidden in a ring of mountains. Seeing mountain ranges like e.g. the Andes on Earth, I can't see anything wrong with mountains next to water - or is there?
The issue isn't so much "mountains next to water" as the shape of the mountains. Mountain ranges on Earth don't form circular loops because they generally form along plate boundaries. The issue is "How was this world made?"
While the world is supposed to be round, the continents are depicted as if "flattened out", the white northern as well as the southern rim are the north and the south pole respectively ..
Anything wrong with that?
A map that does that doesn't preserve shapes. That's what I meant when I said the circle wouldn't be circular.