As rivers flow towards the sea, they impact the landscape through which they pass. Firstly, they cause erosion of both the riverbed and its banks, dislodging stones and other material. Secondly, they ...

At 4,130 miles (6,650 km) long, the Nile in Africa is the longest river in the world. Some people consider the Amazon in South America to be longer. This is because the many hundreds of channels that ...