As the mouth is choked with sandbanks, goods are disembarked at Mariinsk and carried by train (9 m.) to Alexandrovsk at the head of the Gulf of Tartary.
Its mouth is divided by sandbanks into many channels.
In front of the delta are sandbanks and rocks which prevent the passage of vessels except by a canal, 18 m.
One consequence of this is that the bed of the river just below Hamburg is obstructed by a bar, and still lower down is choked with sandbanks, so that navigation is confined to a relatively narrow channel down the middle of the stream.
The sea immediately east of the town has a considerable depth, but its navigation is impeded by sandbanks and a bar north and west of the town, which can be passed only by vessels drawing not more than 9 ft.