What are the Great Lakes?

What are the Great Lakes?

The Great Lakes are important for Ontario's natural environment. They moderate the climate, funnel migratory birds, provide vast marshlands, and create needed habitats offshore for living things. The Great Lakes make up the largest fresh-water lake system in the world. High human population density and what has turned out to be lower than expected ecological resilience have affected the Great Lakes greatly, yet their essential physical character has stayed the same. [VH] {OH}