Sunspear

Dorne, also known as Sunspear, is the seat of House Martell and the capital of Dorne, southernmost of the Seven Kingdoms, located in the far southeast of the continent on the Summer Sea. It consists of a strong, fortified castle and a town that sprawls around it. It is a town built largely of mud and straw. The town's largest structure is Spear Tower, a 150-feet structure with a pinnacle of shining steel.

In the books
In the A Song of Ice and Fire novels, Sunspear is the principal stronghold of House Martell. It is located on the far-eastern coast of Dorne and consists of two strong towers, the Spear Tower and the Tower of the Sun, the latter of which contains the Prince of Dorne's throne room. The castle walls are sand-colored, setting it apart from the other major castles of Westeros.

Sunspear is surrounded by the shadow town, which consists of shops, markets and bazaars. The town is also walled, though more buildings - mostly mud-brick hovels - stretch beyond it. The castle and town also have a modest harbor. Areo Hotah, who is from the Free Cities, notes that the town around Sunspear isn't really large enough to be considered a true "city" on the scale of Norvos, Pentos, or King's Landing, but it is still the largest settlement in Dorne.

Notable residents of the castle

 * Prince Doran Martell, the ruler of Dorne in the name of the King.
 * Princess Arianne Martell, Prince Doran's firstborn daughter and heir.
 * Prince Trystane Martell, Prince Doran's youngest child.
 * Prince {Oberyn Martell}, called the Red Viper, Prince Doran's younger brother.
 * Ellaria Sand ​, Prince Oberyn's paramour and mother of five Sand Snakes.
 * The Sand Snakes, Prince Oberyn's eight bastard daughters.
 * Areo Hotah, Doran's trusted captain of the guards. Originally from the Free Cities.