The principal tributary of the Vazhinka is the Muzhala (left).

The same cannot be said of the Tiber's three principal tributaries, each flowing in a generally southward course.

It is the principal left-bank tributary of the Insiza River.

The principal tributary of the Oredezh is the Suyda (left).

Its principal tributary from the north is the Chenango River.

The principal tributary of the Ping is the Wang River.

The principal tributary of the Shelon within the district is the Sudoma (left).

Since this period the Amazon itself and all its principal tributaries have been frequently visited.

It is the principal tributary of the Srepok River.

Both of these are also considered principal tributaries of the Cheat River.