The Sandship is the ancient keep of House Martell. It is now part of Sunspear in southeastern Dorne.
The Sandship is a squat, ugly keep. It looks like a dun-colored dromond that has washed ashore and turned to stone.
After the Rhoynish Wars, Nymeria led the Rhoynar in their ten thousand ships to Dorne, where she wed the Lord of the Sandship, Mors Martell, a lesser lord of Dorne. The alliance of the Martells and the Rhoynar allowed Nymeria and Mors to conquer the rest of Dorne in Nymeria's War, however. The Princes and Princesses of Dorne made their seat Sunspear, the great castle which developed around the Sandship.