Define the following terms related to rivers: Source, Mouth, Tributary, and Catchment area.

Here are the definitions for the terms related to rivers:

1.1 Source (2)
The source of a river is the original point from which the river flows. This can be a spring, a lake, a glacier, or an area of high ground where rainfall collects.

1.2 Mouth (2)
The mouth of a river is the place where it empties into another body of water, such as a larger river, a lake, a reservoir, or an ocean.

1.3 Tributary (2)
A tributary is a stream or river that flows into a larger main river or a lake. It does not flow directly into a sea or ocean.

1.4 Catchment area (2)
A catchment area (also known as a drainage basin or watershed) is an area of land where all precipitation that falls within it drains off into a common outlet, such as a river, lake, or ocean.