Thanks Diyakaruza!
Yes, for "Kushite Bay", I tested the creation of very steep slopes, following a great gaming experience discovering the magnificent "Buttes Sahyadry" map; this map has a very high plant density in addition to the beautiful, highly worked mountains.
For "Kushite Bay", I left a sort of central rocky peak, topped by the Kushite statue of an ibis; this peak allows the camera to get a quick overview of the different islands on the map.