Whitethorn is a city in Tortall. It is tucked into a delta formed by the rivers Olorun and Tirragen. The city has existed for more than two hundred years, although it is unknown when it was first founded. In the middle of the third century of the Human Era a royal work farm was situated there. Orva Ashmiller was sent there for disturbing the peace, using violence against her family and attacking guardswoman Clara Goodwin with a heavy knife.