Entrepôt:
port where goods for import or export can be stored without paying import duties:
Hong Kong is the most important entrepot for the Chinese mainland.
[Cambridge English Dictionary]
Noted in War and Peace and War, Peter Turchin, Chapter 2:
The Ukrainians referred to Caffa as “the vampire that drinks the blood of Russia because both under the Genoesee and after its conquest by the Turks this port city was the main entrepôt for the slave trade on the Black Sea.
