Regarding the thalweg of a river, the statement that is not true is:
- it is the dividing line between nation-states separated by rivers
Explanation:
1. The thalweg of a river is the line connecting the deepest points along the length of the river.
2. It is not the dividing line between nation-states separated by rivers. Borders between countries are determined by various legal and political agreements, not by the thalweg of a river.
3. The thalweg can influence the flow of the river, as it represents the path of least resistance for the water.
4. It is typically found just under the surface of the water, above the deepest point of the river.
5. The thalweg is associated with the fastest flow of water within the river and can impact the formation of features like point bars and oxbow lakes.