Here is an update. Left frame is Longshore. The icons on the left frame are not made by me. It's from another Mutant Chronicles map. The right frame is a cutaway map (and the cities are made by me). The client wanted Longshore to... *takes a deep breath* ...be positioned in a crater, in a ravine, in a cave, on an underground island in an underground lake, with a city below in another cave, just under the city on the island in the cave in the ravine in the crater on mercury.
I haven't done anything with the border yet, but I'll try to match it better with the parchment.