– Largest reservoir in the United States – Rapidly declining water levels
– Once one of the largest lakes in Africa – Shrunk by over 90% in the past 50 years
– Florida's largest freshwater lake – Pollution problems
– Utah's largest lake – Shrinking size and increasing salinity – Important habitat for birds and other wildlife
– Kazakhstan's largest lake – Potential for mineral extraction – Said to contain large deposits of copper, gold, and other minerals
– Africa's largest lake – Overfishing and pollution problems – Major source of food and water for millions of people
– Russia's largest lake – Unique biodiversity and potential for tourism development – Home to a variety of endemic species
– South America's largest lake – Cultural and spiritual significance – Sacred site for the Aymara people
– Popular tourist destination in the United States – Declining water quality – Source of drinking water for millions of people
– Reservoir created by the construction of the Aswan Dam – Impact on the Nile River and the environment – Provided electricity and irrigation water for millions of people