Tumbleton

Tumbleton is a castle in Game of Thrones. It is a holdfast in the Reach, the region controlled by House Tyrell of Highgarden. The castle is located north east of Highgarden in the headlands of the Mander near the border with the Crownlands. It is south west of King's Landing.

In the books
In the Song of Ice and Fire novels Tumbleton is the seat of House Footly. Its location is the same.