You may not know it, but a global celebration of the world's waterways has taken place on the last Sunday of September every year since 2005. From rallies and special film screenings to community cleanups and riverside get-togethers, this annual event highlights the importance of our rivers and the need to protect them.
In honour of World Rivers Day 2017, here are some of our favourite river recordings from around the world.
Agua Azul cascades recorded in Chiapas, Mexico by Richard Beard (BL ref 149032)
Riverside atmosphere recorded in Wedza, Zimbabwe by Nigel Tucker (BL ref 125784)
River Dart below the surface recorded in Devon, England by Peter Toll (BL ref 212542)
Boyd River atmosphere with frogs recorded in New South Wales, Australia by David Lumsdaine (BL ref 150641)
Be sure to check out the Twitter hashtag #WorldRiversDay for more info on the day's events. You can also find other watery sounds in the Environment and Nature section of British Library Sounds.