Pergamon Acropolis: view westwards over the Selinus valley through the window of a defensive tower.
Two tributaries of the Bakır Çayı river (the ancient River Kaikos) pass on either side of the Pergamon acropolis: to the west the Bergama Çayı (the ancient Selinus) which flows through Bergama (see also gallery 1, page 3); and to the east the Kestel Çayı (the ancient Ketios) which was dammed in 1992 below the acropolis to form an artificial U-shaped lake (see gallery 1, pages 25 and 26).
