Terebinthia is the island found of the northeast coast of Archenland. There isn't much to say about this islands for there isn't much told to us about it in the Chronicles. We do know that the island had its own King. He sent warning to the voyagers on the Dawn Treader that there was sickness on their island and that they should not land on it. Also, during the book The Silver Chair, Aslan had been reported as being seen on Terebinthia. This caused Caspian X to set sail in search of him to ask of him who should rule after he died.