Before the St Ives estate was formed, Harden Moor stretched from Bingley in the east to Cullingworth in the west. In 13th century deeds, Ellar Carr Beck (which drains down from Lees Moor and skirts the northern edge of Cullingworth) was defined as the western edge of Harden. This area included Catstones Moor and north up to Hainworth Shaw. Opinions vary as to what the boundaries of Harden Moor are; 18th and 19th century texts describe Harden Moor as including Altar Rock (Druid's Altar) and the land surrounding. In modern archaeological data, Adrian Chadwick describes Catstones Ring on Catstones Moor as being on the southwestern edge of Harden Moor.