Where was the place where Moses followed al-Khidr and met the boy?

According to the famous verses at Surat Al Kahf, 60-74: > And [mention] when Moses said to his servant, "I will not cease [traveling] until I reach the junction of the two seas or continue for a long period." Until Moses met with Khidr, where they later went on a ship: > So they set out, until when they had **embarked on the ship**, al-Khidh r tore it open. [Moses] said, "Have you torn it open to drown its people? You have certainly done a grave thing." Later: > So they set out, until when they met a boy, al-Khidhr killed him. **Where did Moses follow al-Khidr?** (or where did they met the boy?)