The Golden Horn is the arm of the Bosphorus Strait penetrating into the land. The Golden Horn is 8 km. and the length of its shores reaches 18 kms. Haliç is also known as the Golden Horn. The most important concept about its formation dates back to 7000 years . According to this, 7000 years ago Alibey and Kağıthane streams merged with the waters coming from the Istanbul Strait and thus formed the Golden Horn. The traces of many civilizations are still hidden under the waters of the Golden Horn today. Along the banks of the Golden Horn there are numerous buildings from the Ottoman and Byzantine times. Efforts as to clean the waters of the Golden Horn and to bring it to its original state are being carried out and resulting positive.
The Bosphorus Strait is a place adored by the world and is a symbol of İstanbul. Bosphorus which is the only passage connecting the Black Sea to the Mediterranean displays a marvellous tableau inspiring composers and poets while giving transit opportunity to foreign flag vessels. Today there are two bridges erected over the Bosphorus , namely the Bosphorus Bridge and the Fatih Sultan Mehmet Bridge. The width between Anadolu Feneri and Rumeli Feneri is 3600 m while the width between the castles is 698 m