Gusty Gorge is a canyon where the winds from the north, south, west and east converge in, making it full of catastrophic cyclones (as Happy said, in the episode "Leaf It To Sneezy") which can tear everybody apart, or blow them to the other side of the world. Hildy's chosen this place to banish Queen Delightful by having her taken by the Leaf Monster, who she formed and instructed to do so.