Type: place
It is the hometown of Balaam.
Numbers 22:5He sent messengers to Balaam son of Beor), at Pethor on the River, in the land of his people, to summon him, saying, “A people has come out of Egypt and covers the face of the land; they are living next to me.
It is described as "on the River," and since Pethor is believed to be in the Mesopotamia region, it is presumed to be the Euphrates River.
Deuteronomy 23:4because they did not meet you with bread and water on your way out of Egypt, and because they hired against you Balaam son of Beor) from Pethor in Mesopotamia to curse you.