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 is the island of Galma, a duchy under the authority of the Kingdom of Narnia.

History
The first mention of this island was made during Susan and Lucy’s memories in Prince Caspian and in more detail later in The Voyage of the Dawn Treader; Drinian mentioned it when he was telling Edmund Pevensie, Lucy Pevensie and Eustace Scrubb about the ship's journey so far, 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 ship and had to face it for three days.