The Golden Horn is a peninsula in Istanbul, where the Topkapı Sarayı Palace, Sultan Ahmet Camii and the Aya Sofya Müzesi are located.

The Golden Horn is originally a natural watershed of common rivers flowing into the Bosphorus in Istanbul. It is 7.5 km long and 750 meters wide at the highest point and is about 35 meters in the Bosphorus.

This bay separates old Istanbul from Istanbul and modern Istanbul. It is one of the most important and best natural ports in the world. The Golden Horn is one of the most important tourist attractions in Istanbul, not only because of its historical and archaeological features but also because of its magnificent scenery, especially at sunset.

During the Byzantine and Ottoman periods, the Golden Horn was a commercial port and a popular residential area. The Golden Horn entrance was blocked by a huge series of walls along the coast to protect the city from attacks coming by sea.