Katoomba is the main town and council seat of the City of Blue Mountains in New South Wales, Australia, and is the administrative centre of Blue Mountains City Council. Katoomba is located on the lands of the Dharug and Gundungurra Aboriginal peoples. Situated on the Great Western Highway, Katoomba is home to the Three Sisters, 102 km west of Sydney Central Business District and 39 km south-east of Lithgow. Katoomba railway station is on the Main Western line.