Kingdom Valley is an Action Stage in Sonic the Hedgehog (2006). It is north-east of Soleanna and once housed its old kings. The last resident of this place was the Duke of Soleanna but following the events of the Solaris Project, Kingdom Valley was largely abandoned. In the present, it is the site of one of Dr. Eggman's bases. Kingdom Valley abounds with water so the ancient ruins and weak wood platforms are not the best footholds.