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  • Administrative boundaries of countries inside the Baltic Sea catchment area. The source is Open Street Maps data downloaded from OSM Boundaries Map (https://wambachers-osm.website/boundaries/)

  • Baltic Sea coastline. The source is OpenStreetMap data downloaded from http://openstreetmapdata.com/data/coastlines and processed at HELCOM. This data contains all the detail available in OSM by 31 Jan 2018.