Question

1. The river system of an area is called
River
Drainage
Channel
perennial​

Answer 1

Answer:

The river system of an area is called drainage .....

Answer 2

Drainage

Explanation:

A river system is all parts of the river both upstream and downstream. The river begins at its source in the mountains be it a spring or a glacier, and ends at the river's mouth where it joins a bigger waterbody like a sea or another river. Between the source and mouth, the river flows in multiple channels and tributaries that irrigate the watersheds, flood plains, etc. It finally drains into the sea at the mouth of the river. Sometimes, the river system is also referred to as drainage.