Canada

• The Atlas of Canada Base Maps
• Canadian Geospatial Data Infrastructure
• GIS Data Depot

United States

• Map Layers Warehouse: National Atlas of the United States
• Geography Products: United States Geological Survey
• Federal Geographic Data Committee: National Geospatial Data Clearinghouse
• Geospatial Datasets: National Resources Conservation Service
• GIS Data Depot

International

• World Basemap Data: Environmental Systems Research Institute
• Shoreline and Coastline Data: NOAA National Geophysical Data Center
• International Bathymetric Chart of the Arctic Ocean (IBCAO):
  NOAA National Geophysical Data Center
• Online Maps and Graphics Database: UNEP/GRID-Ardenal
• GEO Data Portal: United Nations Environment Programme
• NOAA Observing System Architecture
• Digital Chart of the World: Penn State University Libraries
• Digital Map of the Baltic Sea Region
• Geography Network
• European Umbrella Organisation for Geographic Information
• Federation of Earth Science Information Partners

Baltic Sea Region Watersheds
(View larger image.)

Shaded relief image