Kennedy explored the northern tributaries of the Darling, and a river in S.
In the north of the department; the Oise, traversing the northwest, with its tributaries the Serre and the Aisne, the latter of which joins it beyond the limits of the department; and the Marne and the Ourcq in the south.
Below Kuhsan it receives fresh tributaries from the west.
Its chief tributaries on this last portion of its course are the Alz and the Salzach, and at Passau, 309 m.
Several large tributaries: - on the right, the Berezina, connected with the W.