The isles - The coast land of the Mediterranean, used here to show that the most distant countries are to hear and marvel at Israel’s wonderful restoration.
Related Commentaries of Jeremiah 31:10
Jeremiah 31:10
10 Hear the word of the LORD, O ye nations, and declare it in the isles afar off, and say, He that scattered Israel will gather him, and keep him, as a shepherd doth his flock.