Turkish Maritime Organization (Turkish: Türkiye Denizcilik İşletmeleri A.Ş., TDİ) is a state-owned company responsible for the operation of certain harbor and shipyards in Turkey. Its headquarters is located in Karaköy quarter of Beyoğlu district, Istanbul. Presently, the harbors owned by the company are as follows: * Sarayburnu (İstanbul, European side) * Kuruçeşme (İstanbul, European side) * Kabatepe (Çanakkale Province) * Gökçeada-Kuzu (Çanakkale Province Gökçeada island ) * Güllük (Muğla Province) * Paşalimanı (Balıkesir Province) * Taşucu (Mersin Province)