 Almost all of the harbour is navigable by sailing vessels with no submerged rocks or navigational hazards except for a small area around Black Swan Island at Old Bay in the harbours north.Of the four main inflows only Melaleuca Creek is truly navigable and maintains a depth in excess of for more than upstream of "Claytons Corner" which provides marine access to Melaleuca.With the exception of the waters around the harbour entrance, most of the harbour has a relatively flat seabed with an average depth of .