Yassıhüyük is a neighborhood in Polatlı District, in Ankara Province, Türkiye. Yassıhüyük lies at 696 m above sea level, 6.2 km from the Anatolian plateau mountains. It has 271 inhabitants. The nearest city is Şehitlik, 13.8 km to the southeast. Among the landmarks around are Gordion (1.3 km), Gordion Museum (0.6 km) and Mehmetçik Monument (10.8 km). Among the natural features are Duatepe Hill (8.3 km).