The Prairie Pothole Region was once the largest expanse of grassland in the world – the Great Plains of North America. 10,000 years ago, when the glaciers from the last ice age receded, millions of shallow depressions were left behind. They are known as prairie potholes.
Though the potholes are important waterfowl breeding habitat, they are also excellent sources of mosquitoes! There is nothing more pleasant than a summer when this pothole is dry and the mosquitoes are few and far between.