Map showing the location of Sarsfield
Sarsfield is a castle in the Westerlands and the seat of House Sarsfield, a noble house sworn to House Lannister of Casterly Rock. It is located southwest to Golden Tooth and northeast of Casterly Rock, being connected to the two castles through the River Road, and northeast of Hornvale.
In the books
In the A Song of Ice and Fire novels, Sarsfield is the seat of the eponymous House Sarsfield.
See also
Sarsfield on A Wiki of Ice and Fire (spoilers from the books)
References
Template:The Westerlands