A river's journey from its source to its mouth is fascinating and complex. It can be divided into three distinct sections, each with its unique characteristics and features.

1. Upper Course – The upper course is the beginning of the river's journey. It's located near the river's source, often in mountainous or hilly areas. Here, the river flows swiftly, carving its path through the landscape.
2. Middle Course – The river's pace begins to slow down as it enters the middle course. It widens and begins to meander, forming bends and loops. This section is characterized by a significant amount of erosion, deposition, and transportation of sediments.
3. Lower Course – The lower course marks the final leg of the river's journey. As it nears the sea or ocean, the river's speed decreases, and it expands even further.

This topic is particularly crucial for candidates preparing for the IAS Exam .