Yenikapı Transfer Center (Turkish: Yenikapı Aktarma Merkezi), referred to as Yenikapı, is an underground transportation complex in Istanbul. It is located in south-central Fatih in the neighborhood of Yenikapı, hence the name of the hub. The complex is right next to the, indefinitely closed, Yenikapı railway station and a short walk away from the Yenikapı Ferry Terminal and İDO ferry service. Yenikapı complex links two stations of Istanbul Metro to a railway station of the Turkish State Railways on the trans-Bosphorus Marmaray tunnel. Yenikapı is the largest rapid transit station in Turkey.