Knit a river at the Eden Project

Attention knitters! If you fancy getting your needles round an unusual and worthwhile project, Carla Wentink, a guide at the Eden Project in Cornwall is raising awareness of World Water Day by knitting a giant woollen river. The Project already has a proven track record in quirky knitted items, having made the 'world's largest knitted Christmas tree' last year, which also helped a lot of good causes.

If you feel up to the challenge, Carla can be found over the next few weeks with a very large ball of blue wool at various locations around Eden, and is inviting members of the public to join her until World Water Day itself (March 22). WaterAid, the charity behind World Water Day, is an international non-governmental organisation dedicated to giving people access to clean water. If you're a health freak, you might also want to try out their 'hydration calculator', which tells you whether or not you're getting enough of the wet stuff. And if they can't tell you, who can?