Picture outdoor travel in the upper midwest of the United States and an image probably comes to mind of flat forests and flat fields—if anything comes to mind at all.

In fact, the region is home to a variety of unexpected natural treasures,. Among those: the world’s largest freshwater dune system.

These dunes scattered along the shores of the five Great Lakes—Superior, Huron, Michigan, Erie, and Ontario—were formed 3,000 to 6,000 years ago (recent in terms of geological terms) when the water level of the lakes was 40 feet (12 meters) higher than it is today. Every U.S. state and Canadian province that borders a Great Lake has at least one sand dune preserve area, including Indiana where there are some wonderfully scenic dunes not far from the powerfully unscenic blighted industrial town of Gary.

Arguably the coolest place to experience the Great Lakes dunes is at the Nordhouse Dunes Wilderness Area in western-central Michigan.

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