three sisters rock formations in the blue mountains of australia. the three sisters are believed to be formed by land erosion

three sisters rock formation blue mountains national park erosion escarpment jamison valley katoomba meehni wimlah gunnedoo great dividing range sydney mystic forest australia oceania aussie australasia south wales nsw mountainous landscape peak mountain cliff mount nature green dramatic travel beautiful crag hiking landform steep tectonic volcanism summit elevation formations australia believed formed land 200 million years triassic period names 922 918 906