Data, maps, and reports are available at the lake-level (Great Lakes), for each state, and for the five-state region as a whole by clicking on the links below: Brief reports that summarize, analyze, ...

Take an underwater journey as researchers deploy sonar technology to map the lakebed to document organisms that call it home. The goal is to provide data to fishery and hatchery managers and those ...

The five famous Great Lakes in North America—Superior, Michigan, Huron, Erie, and Ontario—are known for their vast size, natural beauty, and importance as a major freshwater system and ...

The Great Lakes refer to the five large lakes in eastern North America. They are Lakes Superior, Michigan, Huron, Erie and Ontario. Together, they cover an area of about 245,660 sq km. They form ...