Adam Clarke on Obadiah 1:20

Zarephath - Sarepta, a city of the Sidonians, 1Kgs 17:9. That is, they should possess the whole city of Phoenicia, called here that of the Canaanites.

Which is in Sepharad - This is a difficult word. Some think the Bosphorus is meant; others, Spain; others, France; others, the Euphrates; others, some district in Chaldea; for there was a city called Siphora, in Mesopotamia, above the division of the Euphrates. Dr. Lightfoot says it was a part of Edom. Those who were captives among the Canaanites should possess the country of the Canaanites; and those whom the Edomites had enslaved should possess the cities of their masters. See Newcome and Lowth.