It has a rather broad river valley bounded by low hills and has relatively few significant tributaries.

Starting from the river's source, significant tributaries of Maritsa include:

There are some small tributaries, most significant of them are:

Downstream of Pontneddfechan the river has few significant tributaries.

The river is much branched and many of the significant tributaries are of a similar size to the main river.

The significant tributaries of the Saguenay are (in upstream order):

The Sandspruit is its only significant tributary in the lowveld.

It is a significant tributary of the Chattahoochee River.

Both of these less significant tributaries appear to be unnamed.

Although the river has few significant tributaries, it picks up a few small streams on its course.