Hyrkania

From AoCWiki

Savage horse tribes of the interior steppes, uncivilized in all but the arts of war at which they excel, the Hyrkanians move upon a shifting sea of unrest as turbulent as the fiery ponies upon which they ride. The Hyrkanian tribes war constantly amongst themselves, but when united under a great chief, they destroy armies as swiftly as their horse-archers can race across the endless flatlands which encompass them. Trained from childhood in horse and bow, the Hyrkanian cavalry has been called with good reason the finest horse-archers in the world.

The Geography of Hyboria
North	Vanaheim - Asgard - Hyperborea - Cimmeria - Border Kingdom - Brythunia
South	Black Kingdoms - Zembabwei - Vendhya - Kosala - Kush - Darfar - Keshan
	Punt - Stygia - Iranistan
East	Kambuja - Khitai - Uttara Kuru - Meru - Kusan - Hyrkania
West	Zingara - Pictish Wilderness - Argos - Aquilonia - Ophir - Nemedia - Shem
	Koth - Khoraja - Corinthia - Khauran - Zamora - Turan