![](http://www.alamy.com/thumbs/6/34393F85-9367-4ACF-8521-CF68E6044DF1/2ADFN7N.jpg)
Waterfall. Photographed in Matthiessen State Park, Illinois, USA.
Size: 2912px × 4368px
Photo credit: © MICHAEL SZOENYI/SCIENCE PHOTO LIBRARY / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: america, american, cascading, environment, falling, geographical, geography, geological, geology, illinois, layer, layers, matthiessen, nature, north, outcrop, oxidised, oxidized, park, river, riverbed, rock, sedimentary, state, states, strata, stratum, united, usa, water, waterfall