The Gale Ruins are found in the heart of a giant tornado that has risen up around an area called Whirlwind Peak. The residents of the town had to evacuate and it is now known as the Ghost Town.
The ruins themselves contain large mechanisms that suck up objects caught by the storm and drop them inside. Evann and his party enter this way by riding a damaged plane through the tornado.
The boss of the Gale Ruins is the Bone Mantis, which can be found in the Great Engine Room.