Potential Unused Passage in Southern Thanalan?

[Felis]

Remember that the maps were cut drastically in the transition from 1.0 to 2.0 for which there were many roads, entrances and zones simply "leftover" and that probably will not have any use or be used much later (as Castrum Oriens)

the only maps that got transfered from 1.0 to ARR are the city maps from gridania, Limsa and Ul'Dah.
Everything outside of the cities got designed from stratch.