The stream and its marshy edges

At the bottom of the valley, this stream and its marshy edges play a fundamental role in the water cycle. The wet area acts like a sponge and stocks the winter rainwater; it helps to limit flooding and provide water to the stream during dry periods. Acting like a natural filter, the soil and plants that develop here help to improve the quality of the water by eliminating pollution. This environment is also colonised by willow trees, easily recognisable in the spring by its white flowers or catkins.