Strange Seas - Stranger Lands
Aquartica (needs better name)
No one can reach Aquartica unaided, you need either magic or technology to breathe under water for long enough to reach Aquartica.
Since Aquartica is so seldomly reached by outsides there are not yet an agreement on what an Aquartian looks like.
The civilization of Aquartica is a weird mixture of magic and technology something most magic users would find an abomination mixing magic and technology, but the Aquartians are like no other races around.
One is free to come and go, and they are in thoery open to trade if the offer is good enough but it is so difficult to reach that trade has not happened in remembered history.
The city is constructed by sea materials, seaweed, unplaceable stone not known any other place.
The “buildings” in this city is has geometry that is wrong, made mostly of greenish stone.
There were wast angels dizzying heights, and bass reliefs, and great stone surfaces too great for this world. The geometry is abnormal, none nuclidian, dimensions apart from ours.