Great Lakes Watersheds The map color codes every drainage basin…

Great Lakes Watersheds The map color codes every drainage basin (watershed). A watershed can be as small as a few acres draining into a farm pond or as large as several thousand square miles for a major lake, such as one of our Great Lakes. For example, on this map, all the different watersheds for …

The Baltic Sea drainage basin. Land cover and population…

The Baltic Sea drainage basin. Land cover and population density. The Baltic Sea drainage basin with land cover (left) and population distribution (right). Dark green: forests; light green: open and agricultural spaces; different shades of orange: population density. Red lines designate drainage sub-basins. Figures are by Hugo Ahlenius, GRID-Arendal Baltic Environmental Atlas.