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Ramsar Convention : Horicon National Wildlife Refuge

The Largest Cattail Marsh in North America

The Marsh were I saw the largest number of Green Herons by far. Green Herons (Butorides virescens) Horicon National Wildlife Refuge, Wisconsin, United States of America. Ramsar site no. 511.


Stoped in at this marsh as I was heading to a grand trip to the American Prairies and I was most pleased with what I came across in the large marsh. It was a location of many firsts for me to come across which I found most pleasantly surprising and it warrants another visit in the future.

Horicon Marsh was created by the Green Bay lobe of the Wisconsin glaciation during the Pleistocene era. The glacier, during its advance created many drumlins (a glacial landform) in the region, many of which have become the islands of Horicon Marsh. The marsh and surrounding Dodge County have the highest concentration of drumlins in the world.

During the glacier's retreat, a moraine was created, forming a natural dam holding back the waters from the melting glacier and forming Glacial Lake Horicon. The Rock River slowly eroded the moraine, and the lake drained. As the levels of silt, clay and peat accumulated in the former lake's basin, the Horicon Marsh was formed.

The Horicon Marsh State Wildlife Area is one of nine units of the Ice Age National Scientific Reserve system, being considered to contain unique, representative evidence of the Ice Age of the Pleistocene era.

Out sunning where they can, Western Painted Turtles (Chrysemys picta bellii) Horicon National Wildlife Refuge, Wisconsin, United States. Ramsar site no. 511.

Tree Swallow (Tachycineta bicolor) Horicon National Wildlife Refuge, Wisconsin, United States. Ramsar site no. 511.

On the Boardwalk

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