Its mouth is divided by sandbanks into many channels.
Of water in the dry season, but it has many sandbanks and minor difficulties.
Above Agram the Save is used chiefly for floating rafts of timber; east of Sissek it is navigable by small steamboats, but, despite its great volume, the multitude of its perpetually shifting sandbanks interferes greatly with traffic. Steamers also ply on the Una, the Drave below Barcs, and the Danube.
In front of the delta are sandbanks and rocks which prevent the passage of vessels except by a canal, 18 m.
Its coast is studded with low islands and sandbanks, the results of the deposits brought down by the Hwang-ho.