Deuteronomy 4:41-43

Then Moses had three towns marked out on the far side of Jordan looking to the east; To which anyone causing the death of his neighbour in error and not through hate, might go in flight; so that in one of these towns he might be kept from death: The names of the towns were Bezer in the waste land, in the table-land, for the Reubenites; and Ramoth in Gilead for the Gadites; and Golan in Bashan for Manasseh.