The depth of the Bosphorus varies generally between 50-70 metres. This depth increases as the shores of the Bosphorus approach each-other. The deepest point in the Bosphorus lies between the Bebek Mosque and the promontory of Kandilli, where it reaches 160 metres. Between Amavutkoy's Devil's current and the Vanikoy pier, the Bosphorus is 106 metres deep. The depth of the Bosphorus between Rumeli Kavak and the Genoese Castle on the Asiatic shore is 75 and, between Sariyer and the banks of-the Giant's Mountain, 85 metres.
There is a general inclination of 0.001 in the Bosphorus from the south to the north. There are one or two sandbanks in the Bosphorus; the most important ones are known as the "midwife's stool" before the Rumeli Feneri (Beacon) and the sandbanks in between Beykoz and Selvi Bumu, Yenikoy pier and the Kalender promontory and those before Kurucesme village.