***** This project was carried out by Environment and Climate Change Canada in collaboration with the MDDELCC as part of the Saint-Laurent Action Plan (PASL). Since 1988, the governments of Canada and Quebec have worked together to conserve and enhance the St. Lawrence River as part of the St. Lawrence Action Plan (PASL). One of the projects identified under the theme of biodiversity conservation is the development of an integrated plan for the conservation of the natural environments and biodiversity of the St. Lawrence. Identifying priority natural environments for biodiversity conservation was the first step in this planning exercise. However, planning for the conservation of natural environments requires a fair, reliable, accurate and current image of the spatial distribution of ecosystems in the study area. In order to produce an Atlas of areas of conservation interest in the St. Lawrence Lowlands, an updated mapping of the land use of this vast territory was therefore undertaken. This project required reliable information on the natural environments of the St. Lawrence Lowlands. Although numerous excellent cartographic products already exist to delineate different types of environments, they often cover well-circumscribed regions and it was therefore particularly important to obtain a homogeneous product throughout the territory. At the same time, this makes it possible to obtain the best information on its various components: agricultural, aquatic, anthropogenic, wooded, humid environments as well as wastelands and bare soils. Land use mapping in the St. Lawrence Lowlands is thus mainly based on grouping and improving the best existing products for each of the themes.**This third party metadata element was translated using an automated translation tool (Amazon Translate).**