A few of us did try to figure out what seemed to be a logically feasible map of the Original Sin to Ego Draconis era (even though the landscape underwent some indeterminate but reasonably significant upheaval in the meantime), such as Renwex's cartography linked to in this post
but it's absolutely by no means authoritative. Works for me, but is no sort of officially-sanctioned map except inasmuch as a few things were shown in the in-game maps or dialogue, e.g. Driftwood being (due?) south of Aleroth. Even the in-game maps aren't 100% reliable with the compass points not being consistent in DOS2, for instance. But this is still my headcanon map of the area of Rivellon where much of the Divinity series takes place.