Heureuse rencontre j'espère.
Je suis assez curieux de savoir d'où te viennent ces dénominations de contrées (en dehors de la carte apocryphe du lien que tu proposes).
Pour les Darklands, ne s'agit-il pas simplement d'une extrapolation de Karen Wynn Fonstad (KWF), l'auteur de cette carte??? Je crois que c'est le cas....
En tout cas, comme le dit Dior, ce terme n'existe pas dans HoME, ni dans le Silmarilion.
...Et même si l'on trouve le mot "Southland" dans HoME IV "THE SHAPING OF MIDDLE-EARTH"..., ça ressemble plus à une indication de la position géographique de chaînes de montagnes (en fonction des points cardinaux) que le nom d'une contrée proprement dite.
"For their further protection the Valar thrust away Middle-earth at the centre and crowded it eastward, so that it was bended, and the great sea of the West is very wide in the middle, the widest of all waters of the Earth. The shape of the Earth in the East was much like that in the West, save for the narrowing of the Eastern Sea, and the thrusting of the land thither. And beyond the Eastern Sea lies the Eastern Land, of which we know little, and call it the Land of the Sun; and it has mountains, less great than those of Valinor, yet very great, which are the Walls of the Sun. By reason of the falling of the land these mountains cannot be descried, save by highflying birds, across the seas which divide them from the shores of Midd1e-Earth.
And the thrusting aside of the land caused also mountains to appear in four ranges, two in the Northland, and two in the Southland; and those in the North were the Blue Mountains in the West side, and the Red Mountains in the East side; and in the South were the Grey Mountains and the Ye11ow.".
NB: pour "Hyarmenor", ce n'est pas non plus un terme de Tolkien, en tout cas pas dans HoME.
Silmo