The structure of a river system

For anyone who has had to study geography at some point in their education, you’d likely be familiar with the idea of river courses drawn on a map. They’re so important, in fact, that they are often the delimiting factor in the edges of countries, states or other political units. Water is a fundamental requirement of all forms of life and the riverways that scatter the globe underpin the maintenance, structure and accumulation of a large swathe of biodiversity.

So, what is a river?

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