The Royal Hills Zone is a location on Westside Island. The Kingdom of Acorn's capital city, Mobotropolis, is located there. It features rolling, Emerald Hill-esque hills and lush forests.
Some years ago, Rosie Woodchuck and Dr. Chuck the Hedgehog found a young Bunnie Rabbot abandoned in this zone. During the Shattered World Crisis, when the Hooligans and Witchcarters raided Mobotropolis for the Gaia Keys and Chaos Emeralds, they launched their attack from the forest area of Royal Hills. (StH: #281, #284).