Eskişehir is a city in northwestern Turkey and the capital of the Eskişehir Province. In the Byzantine era its name was Dorylaeum. The urban population of the city is 717,135 with a metropolitan population of 826,135. The city is located on the banks of the Porsuk River, 792 m above sea level, where it overlooks the fertile Phrygian Valley. In the nearby hills one can find hot springs. The city is 233 km to the west of Ankara, 330 km to the southeast of Istanbul and 78 km to the northeast of Kütahya. Known as a university town, both Eskişehir Osmangazi University and Anadolu University (which has one of the largest student enrollments in the world) are based in Eskişehir. The province covers an area of 2678 km2.