|This location exists primarily or exclusively within the Sonic Underground continuity.|
Information in this article may not be canonical to the storyline of the games or any other Sonic continuity.
The Northern Plains is a snow covered land with evergreen trees and caves.
Dr. Robotnik sent Sleet and Dingo to the Northern Plains in order to search for the Oracle of Delphius. The Sonic Underground soon followed them after spying on their meeting. They eventually got into a fight with Robotnik's underlings, forcing them to escape into a cave. While in the cave, they met an illusion of their mother, Queen Aleena Hedgehog, who advised them. The three siblings were soon cornered by Sleet, Dingo, and their robots however. With the aid of their Medallions though, the Sonic Underground managed to defeat them. The Oracle then appeared to praise the siblings' newfound family unity and powers, before leaving them with his standard cryptic prediction of the future.