In a vision at Troas, a man from which region begged Paul, "Come over and help us"?

Answer: Macedonia

After the Spirit kept them from Asia and Bithynia, Paul saw a man of Macedonia pleading for help, so they set out for Macedonia.

“During the night, Paul had a vision of a man of Macedonia standing and pleading with him, “Come over to Macedonia and help us.””— Acts 16:9 (BSB)