The title of "longest river in the world" has been fought over for centuries ... than just whipping out a measuring tape on a map and checking how long it is. It all depends on where you start ...

Have you ever looked at a river and wondered where all the water has come from? Or where it is going to? My name is Seren and today I'm investigating the UK's longest rivers. This is the River ...

Industries and farming there contribute as much as 40% of China's whole economy. This vast river – the biggest in Asia and third longest in the world – is also hugely important because of the variety ...