I'm going to start off this thread by saying to please keep this discussion civil. What I am proposing here is quite the change, and requires a lot of planning before execution, for me to not waste a bunch of time that could have been better used, so keep in mind that nothing here is set in stone. Oh, and I wont even try to make the pictures in this thread pretty, too much work.
So what am I proposing, I hear you ask?
I have a couple of ideas ;
Numer One : Keep it the same
Keep it the same : Nothing much to say here, we would keep it like Morrowind's. Meh.
Number Two : Raising River Samsi
Raising River Samsi : Still quite boring IMO, but a bit of a step up from the Morrowind version. I would create a waterfall next to Gnisis, this would be a bit more traditional and natural looking. Extra gif.
Number Three : Lowering River Samsi
Landlocked River (suggested by Grumpycat) : This is what I would go with, since this is what was intended by MK (I think (durr)), here is a good remake of the original concept, and it is what I took most of my inspiration from. This would basically require me to lower all, or most of river Samsi, making it a lake that would get all of its water by a (massive) waterfall that would be either next to the Inner sea, or next to Gnisis (as shown in this map (yellow is the lowered land, red is the potential waterfall next to the inner sea, orange is the potential waterfall next to Gnisis)). River Samsi would now look like this. This would also require me to cooperate with Iceflame, as to not completely demolish his Gnisis work. There is a real life equivalent to this called Okavango (google it). It loses 97 % of its water by evaporating into the air, so I would place steam effects at a lot of places in river samsi. This is what Gnisis would now look like (I just jammed everything in here, it was done in a rush).
So, what do you guys think? I really think number three is the way to go, it would allow me to do so much more with West Gash.

I just wanted to clarify, I
I just wanted to clarify, I am currently working on and hold the claim for the city of Gnisis, editing the cells that contain parts of the city would cause conflict.