If you fly south from the room above Loch Terradian you're in the room above Qhabiszan. That is also the case if you fly south from the room above Spiderhaunt. If you're in the room above Qhabiszan and fly north, you're in the room above Spiderhaunt.

The overarea isn't like normal areas, and *attempts* to be geographic, which results in some multiple rooms that lead to one room, like that. It gets adjusted as new areas get added.