Árheimar (Old Norse "river home") was a capital of the Goths, according to the Hervarar saga. The saga only states that it was located on the river Dnieper, which flows from Russia, through Belarus and Ukraine, to the Black Sea.
The name first appears in the Hervarar saga when Angantyr has avenged his father Heidrek and retaken the Dwarf-cursed sword Tyrfing:
It was during this feast that Angantyr's Hunnish half-brother Hlöd appeared with a large army to demand half the inheritance:
The next place is when Angantyr's brave sister Hervor fights the Huns, although, her small army is greatly outnumbered by the Horde and she knows she cannot win:
Arheimar is mentioned for the last time, when the Geatish king Gizur has arrived with his army from Scandinavia to fight for the Goths, and tells the Huns where they and the Goths are to meet the Huns in battle. Hlöd demeans Gizur by calling him an Ostrogoth (Gryting) and Angantyr's man from Arheimar, and not a king of the Geats: