We asked our readers to send in their best pictures on the theme of "waterfalls". Here is a selection of the photographs we received from around the world. Krzysztof Suchnicki took this picture of ...

Graham Woollven: "Man-made waterfalls - weirs, have been used for centuries to control and utilise the power of rivers. This weir is on the River Tavy at Tavistock in Devon." Image source, Mark Li ...

We asked our readers to send in their best pictures on the theme of "waterfalls". Here is a selection of the photographs we received from around the world. Image source, Krzysztof Suchnick.