In the heart of the Flint Hills, the 8,616
Big Basin is a large circular depression. It is about one mile in diameter and about 100
The Kansas Historical Marker stands within a geological feature known as the Big Basin, which is a sinkhole or "sink"
Picking of berries, mushrooms, and nuts is another popular outdoor activity on the Marais des Cygnes National Wildlife Refuge. There are some refuge regulations which guide public use.