Kızılırmak River
Hattusa was the capital city of the Hittite Empire in the late Bronze Age. Its ruins lie near Boğazkale, within the great loop of the Kızılırmak River. At its peak, the city covered 1.8 km² and comprised an inner and outer portion, both surrounded by a massive and still visible course of walls erected during the reign of Suppiluliuma I. The inner city covered an area of some 0.8 km² and was occupied by a citadel with large administrative buildings and temples.