Abstract: The invention relates to a geomat for preventing erosion, for recultivating fallow land and for cultivating plants, said mat being completely biodegradable, cost-effective and simple to produce and fulfilling all ecological requirements. According to the invention, the geomat substantially consists of a continuous strand (1) of untreated sheep's wool, arranged in a serpentine to form the desired width of the mat and held together in a longitudinal direction.