Bocche di Primero (45°42′N 13°28′E) is a narrow opening in the mudbank bordering the coast giving access to Canale di Primero, which leads into Laguna di Grado, and to a boat harbour, protected by two moles, used by pleasure craft. A channel to the boat harbour is marked by five pile-beacons (white with red bands), which are liable to be washed away.