A big thank you to Nathalie for organizing a hike in Seine-et-Marne along the Grand Morin and the Chalifert canal near the Marne, an opportunity to identify 2 areas of relatively dense waste accumulation, take photographs of the particularly beautiful canal under the frost, and share a moment with volunteers over a few marshmallows in a hot chocolate. The Watertrek walking guide is available to anyone wishing to organize an outing on or near water, for pollution mapping purposes as well as for creative and artistic purposes.