Any geography student who's viewed a map of the United States has surely marveled at the vast expanse of the nation's Great Lakes, which contain nearly 20 percent of the Earth's surface water. To stand on the shore of any one of these freshwater inland seas--Superior, Michigan, Huron, Erie, or Ontario--is to gaze across boundless waters to a distant horizon. Now, NOAA's Office for Coastal Management provides another perspective on these impressive water bodies with its new Lake Level Viewer for the U.S. Great Lakes.

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