Many of the University's buildings are located on its South Campus, with the Bosphorus and the historical castle of Rumelihisar as its boundary to the east. This campus encompasses the oldest buildings of the University. The North Campus, Hisar Campus, and Uçaksavar Campus host the relatively recently acquired facilities and are at walking distances from South Campus. The Kandilli Campus, housing the observatory, is on the Asian side of the Bosphorus. Saritepe Campus, near Kilyos on the Black Sea coast is 34 km from South Campus.