Telmar

Telmar was originally an unstable colony of the Calormene Empire within the World of Narnia, but was later, after the decay of its population, absorbed by outsiders into a seemingly anarchical land until it was finally abandoned altogether due to centuries of disorder and ultimately, a widespread famine.

There may have been an island in the South Sea that was also named "Telmar" as it was the final home of the Telmarine people who came from the original Telmar.

History
Telmar, to the far west of the Kingdom of Narnia, was colonised first by Calormene settlers in Narnian-year 300. Two years later, Aslan made the inhabitants into dumb beasts because of their atrocious behavior. The resulting witless savages soon destroyed each other and Telmarine society collased.

In 460, pirates from Earth ended up in Telmar, possibly mixing their wives and families with some surviving Calormene settlers to make an intelligent (but also rough, brutal, and warlike) race of integrated Telmarine people. These were the Telmarines who grew strong in number and eventually invaded Narnia in Narnian-year 1998, during the Telmarine Conquest, after they left Telmar for good due to a famine in their home land. (It was from this line of Telmarines that Prince Caspian X was descended.)

Telmarines, whose own country only had dumb beasts, were scared of Narnia's magical talking beasts and attempted to rid the conquered nation of them. However, in year 2303, these exiled "Old Narnians" who had lived in hiding since the Telmarine regime began, initiated the Narnian Revolution and defeated the Telmarine-Narnians, most of whom were consequently subjugated to an island in the South Sea which is accepted to have also become known as "Telmar".

Telmar Controversy
Since no map of the World of Narnia has ever shown as far as Telmar, its exact location is disputed. There are canonical sources to suggest that it was both a landlocked area to the uncharted west of the Kingdom of Narnia, yet also that it may have been an island to the sea at the south of Narnia. The two ideas are so entirely different in location that it is now generally accepted that there were actually two different Telmars (a formerly-established one to the west and a newly-established one to the south) although it would have made issues easier if the more recent one had been named something along the lines of "New Telmar". There are still some who believe that Telmar had always been only one, single place and that one of the two separate locations was merely a mistake which was never corrected.