There are two cruise ship ports in Istanbul, both located on the European part of the city. And they are both next to each other. The main and larger one is called "Salı Pazarı Yolcu Limanı" and it is located in Fındıklı District. The other one(smaller) is called "Karaköy Yolcu Limanı" and it is located in Karaköy District. They are both 10-15 minutes drive to Sultanahmet(old city).