The current knowledge of hydrogeological fea tures of the territory of the Leningrad artesian basin
The paper presents the content of the hydrogeological map of the Leningrad artesian basin on the scale of 1:500 000, reflecting the current state of groundwater quality in the zone of free water-exchange. The results of studying the quality of ground-water, its macro- and micro-component isotopic composition, protection of basic aquifers against anthropogenic pollution aredescribed.