French Guiana's main seaport is the port of Dégrad des Cannes, located on the estuary of the Mahury River, in the commune of Remire-Montjoly, a south-eastern suburb of Cayenne. Almost all of French Guiana's imports and exports pass through the port of Dégrad des Cannes. Built in 1969, it replaced the old harbour of Cayenne which was congested and could not cope with modern traffic.