The Sidlaws (Scottish Gaelic: Na Sidhbheanntan ), also called the Sidlaw Hills and Sidlaw Range, are a range of hills partly of volcanic origin in the counties of Perthshire and Angus in Scotland that extend for 30 miles (45 km) from Kinnoull Hill, near Perth, northeast to Forfar. Principal peaks within the Sidlaws include Craigowl Hill, Ark Hill and King's Seat.