The Stirling Range or Koikyennuruff is a range of mountains an hills in the Great Southern region of Western Australia, 337 km south-east of Perth. It is located at approximately 34°24′S, 118°09′E and is over 60 km wide from west to east, stretching from the highway between Mount Barker and Cranbrook eastward past Gnowangerup. Notable features include Toolbrunup, Bluff Knoll (the tallest peak for a thousand kilometers or more in any direction and most popular tourist attraction), and a silhouette called The Sleeping Princess which is visible from the Porongurup Range.