Located within borders of Sariyer district and gave its name to the location, covering 30.000 m2 area. There is a monument-art built in the narrowest and flowing(600m) section of the Istanbul Bosphoreus just opposite Anadoluhisari. Although it is known that the region was called "Hermaion" in ancient ages, historian Dukas does not mention this and indicates the location of the castle hill side of mountain known as Fonea down "Sostenion (Istinye). The names of Rumelihisar are : Kulle-i Cedide in Fatih Charities; Yenice Hisar in Ne�ri period history; Bogazkesen Castle in Kemalpasazade, Asikpasazade and Nisanci histories. Although Dukas confused about the names and used as Kefalokoptis, no one else except him used this name.
According to two inscriptions in Buyuk Zaganos Tower and Kucuk Zaganos Pasha Tower, the castle was built in about four month period which is a considerably short period. The art book called "Serh-i Tecriiyd-i Ataik" in Suleymaniye Library, it is said that the building had been completed in (139) days. The timbers used in building were from Izmit and Black sea Eregli; the stones were from various plces of Anatolia and spolis are from destroyed Byzantine buildings located around. In some histories it has been stated that 1000 masters, 2000 workers and many transporters were employed in building but Architect E.H. Ayverdi states that approximately 300 masters, 700-800 workers and 200 transporters, boats, vehicles etc were employed. Mortary volume of the building covering 60.000 m2 area is about 57.700 m3. Mountain Gate, Dizdar Gate, Hisarpence Gate and Sel Gate are four main gates and it also has a secondary gate called Mezarlik Gate.