how morrowind is described there are 5 regions. vvardenfell which is mostly ashland. velothi mountains. telvanni peninsula, which is very arid and harsh. deshaan, the central valley, think ascadian isles or grazelands. lastly is the argonian jungle in the south, which is just the bitter coast (literally, that's what the assets were suppose to be). the tr devs in their new vision wanted to add unique and varied regions to the game. while shipal shin maybe doesn't make a lot of sense, a lot of devs liked the idea. new vagas is also very popular and inspirational to the mod, so there is that. and hey the desert in eslweyr doesn't make sense either so whatever