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Only between the Heresh Valley and the cliffs is there an exit to the sea.
And even further east, near the city of Stonehelm, you could fit a Necropolis :) if you believe Messiah.
I suggest making descents into the Dungeon. Create a second map where there will be the Dungeon, dwarves, and long, long dungeons (you can put the Necropolis near Stonehelm underground). Otherwise, it's great!
I also suggest creating your own imperial palace or ancient city, which you need to infiltrate to obtain some ingredient to assemble the key to the Gates of Chaos, but this city will be guarded by a lot of garrisons, border gates, etc.