Terebinthia

Terebinthia is a sovereign island-kingdom in the Great Eastern Ocean, in the exterior of the Bight of Calormen, the closest island to it being the island of Galma, which is a duchy under the authority of the Kingdom of Narnia.

History
The first appearance of this island is in The Voyage of the Dawn Treader; Caspian X names her when she finds Edmund Pevensie, Lucy Pevensie and Eustace Scrubb as they had made their way to it in the previous days.

The Epidemic
When they wanted to dock, the sovereign of the island sent messengers to the sailing ship to warn the crew not to approach the city, as an epidemic was raging on the population.

The Battle of Terebinthia
After rounding the cape, the crew was joined by a pirate Terebinthian sailing ship and had to face it for three days.