A Chao Garden is any location inhabited by Chao, usually forested and including a small body of water.
In ancient times one of earliest known Chao Gardens was located in at Master Emerald Shrine and was protected by Chaos. Tikal daughter of Pachacamac leader of the Knuckles Clan became friends with the Chao and Chao they lived in piece until the clan attacked the shrine for the Chaos Emeralds Tikal tried to stop them the Knuckles Clan killed the Chao. Chaos became enraged and killed most of the clan Tikal stop him by sealing him and her self in the Master Emerald. (SA/SADX)
On their quest to stop Dr. Eggman and Chaos, Sonic the Hedgehog and his friends Miles "Tails" Prower, Knuckles the Echidna, Amy Rose, Big the Cat and E-102 Gamma. discovered three Chao Garden one in Mystic Ruins, one in Station Square and one on a island next to the Final Egg were the Egg Carrier was found. (SA/SADX)