Windy Valley (ウィンディーバレー Windī Barē?) is a location that appears in the anime series Sonic X. It is a deserted valley with plateau-like rock pillars and extremely strong winds, enough to blow even Tails off his feet.
Windy Valley was first visited by Sonic and Tails during their search for the Chaos Emeralds. Detecting the Emerald underground, Sonic dug it up, only for Dr. Eggman to arrive in his Egg Hornet and take it, along with the Emerald the heroes already had. Confronting Eggman, Sonic took down the Egg Hornet with a Ring-powered Spin Attack, only for the Chaos Emeralds to fall into a lake where Chaos 2 took them to become Chaos 4. With Chaos 4 attacking, Sonic engaged it on the lake, but was at a disadvantage against the creature in its right element. Remembering the strong winds in Windy Valley, Sonic used them to his advantage by having them build up his speed, allowing him to knock out Chaos 4 with a Spin Attack. Retreating with Chaos 4 to his Egg Carrier, Eggman fled Windy Valley with Sonic and Tails hot on his trail.
After his banishment from the Egg Carrier, E-103 Delta got tethered up in Windy Valley. Gamma later visited the same location to rid E-103 Delta's data banks of Eggman's status as their master, releasing his animal battery in the process.