Zartharim was a settlement from the Fourth Age and hometown of the hero Aivas. Nothing else is known about it, and it presumably no longer exists or goes by a different name. Zartharim is only named as part of the riddle[1] on the tomb of Camorra.
References
^Tomb in Dragon Slayer II. Old School RuneScape. "The one from Zartharim sat at the north of the table, opposite the one with the sword."