made ships, &c. This was subsequent to 2Ch_20:36-37. Here Jehoshaphat made "Tharshish ships" to go to Ophir, and, profiting by the experience and warning of 2Ch_20:37, refused the request of Aha-ziah, king of Israel. In 2Ch_20:35 he had joined himself with Ahaziah to make (ordinary) ships to go to Tharshish, which was quite a different thing.
ships of Tharshish = Tharshish ships: i. e, large ocean-going ships.