User blog comment:HalointheSkye/Volume 3 Chapter 12 - End of the Beginning/@comment-25308685-20160221022537

Well in the Afterbuzz for the final 2 Episodes, Miles and Kerry confirmed that they are calling it RNJR Ranger in house, but they are unsure if it will ever be officialy named in the show.

If you look at the map of Remnant you will see very dark Land on the continent that is north from the large landmass on which Vacuo and Vale are, so my money is that that is where "Mordor" is.