Compare the shape of a river and its source mouth?

The shape of a river and its source mouth can vary significantly depending on the specific river system and its characteristics. However, some general comparisons can be made:

1. Source: The source of a river is typically located in an upland area, such as mountains or hills. The shape of the source is often characterized by a narrow and steep channel with a high gradient (slope). The water at the source is usually fast-flowing and may form cascades or waterfalls.

2. Mouth: The mouth of a river is where it discharges into a larger body of water, such as an ocean, sea, lake, or another river. The shape of the river mouth can vary depending on the nature of the receiving water body and the sediment load carried by the river. Some common types of river mouths include:

- Delta: A delta is formed when a river deposits sediment at its mouth, creating a fan-shaped landform. Deltas are typically found in areas where the river has a low gradient and the receiving water body is relatively calm.

- Estuary: An estuary is a partially enclosed coastal body of water where freshwater from a river mixes with saltwater from the ocean. Estuaries are often funnel-shaped and have a distinct shoreline.

- River Mouth Bar: A river mouth bar is a sediment deposit that forms at the mouth of a river where it enters a larger body of water. River mouth bars can be long and narrow or have a crescentic shape.

In general, the shape of a river changes along its course. The upper reaches of a river are typically characterized by a narrow and steep channel, while the lower reaches are often wider and have a lower gradient. The shape of the river mouth is influenced by various factors, including the sediment load, the flow rate, and the interaction with the receiving water body.