A prairie pothole is a kind of freshwater marsh common in the prairies of the Great Plains.

For miles across the plain were heathery grasses, lush fields and silvery sloughs, sometimes called prairie potholes.

Additionally, droughts could dry up prairie potholes essential for the breeding of many species, especially migratory waterbirds.

But some of the drier area, like the prairie potholes, are the most important ecologically.

He acknowledged that nobody could agree on which wetlands, ranging from prairie potholes to huge tidal estuaries, were truly worth preserving.

Drainage of ponds is a frequent problem in agricultural areas, such as in the prairie potholes of North America.

Most of the prairie potholes are smaller than an acre.

The breeding habitat is marshes and prairie potholes in western North America.

"Wetlands" is a broad term applied to ecosystems ranging from prairie potholes to vast tidal marshes.

One part of this, he said, would be the restoration of prairie potholes already drained.