Sunflower Hall, also called Sunhouse, is a castle in the Reach, the region controlled by House Tyrell of Highgarden. The castle is located on the south coast of Westeros. It is the seat of House Cuy.
In the books
In the A Song of Ice and Fire novels Sun House is the seat of House Cuy and is located on the Summer Sea near the mouth of the Torentine. It was called 'Sun House' on the maps of the earlier books, but in the more recent novels it has been changed to 'Sunflower Hall'.
Old Oak · Red Lake · Goldengrove · Bitterbridge · Tumbleton · Grassy Vale · Cider Hall · Ashford · Horn Hill · Brightwater Keep · Bandallon · Honeyholt · Oldtown (Citadel · Hightower · Starry Sept) · Uplands · Blackcrown · Three Towers · Sunflower Hall · Arbor