Stonehelm is a castle in the Stormlands. It is the seat of House Swann, a vassal house holding fealty to House Baratheon of Storm's End. The castle is located southwest of Storm's End on the northern shore of the Sea of Dorne.
In the books
In the A Song of Ice and Fire novels, Stonehelm is located at the mouth of a river, at the western end of Cape Wrath.
- Stonehelm at A Wiki of Ice and Fire (spoilers from the books)