The port of Antwerp is a major entrance; one of the most internationally active ports in Western Europe and for a developed country like Belgium it's remarkably easy to bribe a docker over there. A ton of big time criminal organizations use the port to smuggle in huge cocaine shipments: Italian, Dutch, Albanian, Serbian, Montenegrin, Turkish, Greek, Moroccan...crime groups have all been reported making use of the port. Most of the cocaine that enters the port is destined to be distributed in other regions of the Benelux. Local distribution in Antwerp is mostly handled by a handful criminal Moroccan families from the Borgerhout district.
The Greeks used to control the port. there wasn't a shipment of cocaine coming through without paying off the Greeks, but their activity has been on the low ever since they locked up Eleftherios Papadatos (who's probably about 80 years old at the moment).