Botanical walk guided by Patrick Soulas, from the village of La Roche-Guyon to the slopes of the Seine - duration about 2h30 Among the sites that Patrick loves, the sublime landscapes of the Coteaux de la Seine nature reserve! Passionate about botany, Patrick Soulas has made a specialty of the great landscapes and vegetation that compose them. It takes you to discover amazing environments, habitats and ecosystems. Reservation required on 06 66 84 64 65 - Rendezvous at 14:00 near the fountain of the Roche-Guyon, place de l'écu. The town halls of La Roche-Guyon, Moisson, Bonnières-sur-Seine and Bennecourt joined forces in 2022 to celebrate the Seine, their common living heritage: they offer meetings, animations, conferences on the 4 sites to promote access to biodiversity for all, history, culture, art and literature specific to this territory and create a link in this valley.