Wyl is a castle in Dorne, the region of Westeros controlled by House Martell of Sunspear. The castle is located south-west of Storm's End and is the northern-most castle to hold fealty to Sunspear.
In the books
In the A Song of Ice and Fire novels, Wyl is the seat of House Wyl. It is located near the northern end of the Boneway. House Wyl has tunneled beneath their castle to link caverns for greater defense.
Tower of Joy · Planky Town · Vulture's Roost · Wyl · Blackmont · Kingsgrave · Starfall · Skyreach · Yronwood · Sandstone · Hellholt · Vaith · The Tor · Godsgrace · Saltshore · Lemonwood · Water Gardens · Ghost Hill