Albert Barnes Commentary 1 Kings 9:28

"And they came to Ophir, and fetched from thence gold, four hundred and twenty talents, and brought it to king Solomon." — 1 Kings 9:28 (ASV)

Regarding Ophir, see the marginal reference note. Among the various opinions, three are predominant; with very few exceptions, modern scholars favor Arabia, India, or Eastern Africa. Of these, the claims for Arabia are the most widely supported.