The Indoril stronghold of Idaverrano should be located in or near 19,-15. with some few house ruins in other locations. Both the stronghold and the ruins should be half-buried.
The seafloor in the western part needs colouring. Not all cells need much detailing, only those near points of interest.
All cells need to be filled with Inner Sea creatures.
The interior would need to reflect Idaverrano’s status as old regional seat of House Indoril before the inner Sea existed. The entire interior would be flooded and items would float in the water.