Five hundred years later the kingdoms of the world are clearly defined. The kingdoms of the Hyborians--Aquilonia, Nemedia, Brythunia, Hyperborea, Koth, Ophir, Argos, Corinthia, and one known as the Border Kingdom--dominate the western world. Zamora lies to the east, and Zingara to the southwest of these kingdoms--people alike in darkness of complexion and exotic habits, but otherwise unrelated. Far to the south sleeps Stygia, untouched by foreign invasion, but the peoples of Shem have exchanged the Stygian yoke for the less galling one of Koth. The dusky masters have been driven south of the great river Styx, Nilus, or Nile, which, flowing north from the shadowy hinterlands, turns almost at right angles and flows almost due west through the pastoral meadowlands of Shem, to empty into the great sea. North of Aquilonia, the western-most Hyborian kingdom, are the Cimmerians, ferocious savages, untamed by the invaders, but advancing rapidly because of contact with them; they are the descendants of the Atlanteans, now progressing more steadily than their old enemies the Picts, who dwell in the wilderness west of Aquilonia. Another five centuries and the Hybori peoples are the possessors of a civilization so virile that contact with it virtually snatched out of the wallow of savagery such tribes as it touched. The most powerful kingdom is Aquilonia, but others vie with it in strength and mixed race; the nearest to the ancient root-stock are the Gundermen of Gunderland, a northern province of Aquilonia. But this mixing has not weakened the race. They are supreme in the western world, though the barbarians of the wastelands are growing in strength. In the north, golden-haired, blue-eyed barbarians, descendants of the blond arctic savages, have driven the remaining Hyborian tribes out of the snow countries, except the ancient kingdom of Hyperborea, which resists their onslaught. Their country is called Nordheim, and they are divided into the red-haired Vanir of Vanaheim, and the yellow-haired Æsir of Asgard. Now the Lemurians enter history again as Hyrkanians. Through the centuries they have pushed steadily westward, and now a tribe skirts the southern end of the great inland sea--Vilayet--and establishes the kingdom of Turan on the southwestern shore. Between the inland sea and the eastern borders of the native kingdoms lie vast expanses of steppes and in the extreme north and extreme south, deserts. The non-Hyrkanian dwellers of these territories are scattered and pastoral, unclassified in the north, Shemitish in the south, aboriginal, with a thin strain of Hyborian blood from wandering conquerors. Toward the latter part of the period other Hyrkanian clans push westward, around the northern extremity of the inland sea, and clash with the eastern outposts of the Hyperboreans.