Which one of the following features is related to the lower course of the river?

The lower course of a river is typically characterized by features such as:

1. Wide Valley and Floodplain: As a river approaches its mouth, the surrounding landscape becomes flatter and the river valley becomes wider. This allows the river to spread out and form a floodplain.

2. Meanders: The lower course of a river often contains large bends, or meanders. These are formed due to the river's lateral erosion that widens the river valley.

3. Oxbow Lakes: Sometimes, the meanders can become so pronounced that the river cuts off a meander, forming an oxbow lake.

4. Delta: If the river flows into a body of water like a sea or a lake, it may form a delta. This is a landform that forms from deposition of sediment carried by the river as the flow velocity decreases upon reaching a standing water body.

5. Levees: These are natural embankments along the edges of a river channel. During a flood, material is deposited across the whole floodplain. The heaviest material is deposited closest to the river channel because it gets dropped first when the river slows down.

6. Braiding: This is when the river channel splits into a number of channels that weave in and out of each other. It happens when there is more sediment than the river can carry.

These features are all related to the lower course of a river, where the gradient is less steep and the river has more energy to erode laterally.