The Rumeli Fortress is a 250 meters long and 130 meters wide at its longest with walls surrounding it . It has three large towers and a small one (kule) along with other thirteen small watchtowers (burç) . The towers have the names of their vizier donors , who had also supervised the construction . Next to each of the three large towers , there are three entrances .
The three large towers have peripheries of 23 . 3 meters , 23 . 8 meters and 26 . 70 meters and their heights are 35 , 33 . 3 and 25 . 30 meters without the conical roofs that once crowned the towers . Two of them are round while the last one is twelve-sided on the exterior . At the southwest tower , and also at a smaller tower at the southeast corner , there are inscriptive plaques in Arabic referring to Zaganos Pasa and hence the tower was named after him . Between each tower , there were wooden floors , however , today only the Saruca Pasa Tower retains its wooden floors . There are crenellations at the top of all towers , watchtowers and walls .
There are wooden houses that were built for the soldiers and a small mosque , endowed by Mehmed II at the time of construction
. Only the minaret shaft remains of the original mosque , whereas the small mescid added in the mid 16th century is no longer there . Only one wall-fountain exists from the three wall-fountains that were used to distribute the water supplied to the fortress from a large cistern underneath the mosque .
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