It is joined by four main tributaries, the Drina, Bosna, Vrbas and Una.
The Drina is formed on the Montenegrin frontier by the united streams of the Tara and Piva; curving north-eastwards past Visegrad, it marches for 102 m.
Snipe, woodcock, ducks and rails, in vast flocks, haunt the banks of the Drina and Save; while the crane, pelican, wild-swan and wild-goose are fairly plentiful.
Small steamers ply on the Drina, Save and Una, but the Bosna, though broad from its very source, is, like the Vrbas, too full of shallows to be utilized; while the Narenta only begins to be navigable when it enters Dalmatia.
Ban, each designated by the regional name (Danube, Morava, Drina, Shumaja, Timok and the Ban numeral, e.g.
Army Crown Prince Morava I., Drina I., Alexander Danube I., Danube (126,000 ration II., Timok II., Cay.
Yankovich Shumaja I., Morava II., (67,000 ration Drina II., Morava Bri strength) gade, Army troops.
And Danube II., on the left that of the Pcinja; while Drina I.
Divisions, Drina I.
Only Drina I.
In the centre, Drina I.
Army (reduced to Drina II.
Army, now consisting of Morava I., Drina I., Danube I., Timok II., Morava II.
And Drina I.
This, carried out on the 6th by a part of Drina I., soon developed into an unintended battle, in which Morava I.
On the right and Drina I.
Army (Yankovich) Drina II.
In the northwest the Drina flows for 102 m.
The Save, which is also navigable, meets it at Belgrade, after being joined, at Racha, by the Drina, a Bosnian river, which rises on the Montenegrin border, 155 m.
The valleys of all these rivers, especially those of the Bulgarian and the Great Morava, and of the Nishava, contain considerable areas of level or low-lying country well suited for the growth of corn, and the low grounds along the Save and the Danube from the Drina to the Morava are also well adapted for agriculture, except the tract of fenland called the Machva, in the extreme north-west.
Beyond this belt there appear in the north-west Mesozoic limestones, such as occupy so extensive an area in the north-west of the Balkan Peninsula generally, and the valleys opening in that quarter to the Drina have the same desolate aspect as belongs to these rocks in the rest of that region.
Innumerable aquatic birds haunt the banks of the Save, Danube and Drina, and the lower reaches of the Timok and Morava; among them being pelicans, cranes, grey and white herons, and many other kinds of waders, besides wild geese, ducks, rail and snipe.