Kerkenes Dag, ancient Pteria, from the Cloud 9 hot air balloon. The 7km of city defences follow the rim of the eroded granitic mountain-top. North point at bottom centre, Kiremitlik at top, the Kale (partly in shadow) at left. Many urban blocks and streets are visible; the prominent dark feature is an artificial reservoir, the Buyuk Gol. Sahmuratli village is at centre left. Numerous (? later) tumuli can be seen on the surrounding ridges and slopes.