Loess Hills only exist in two places in the world, Iowa and China. They are a geologic curiosity, so if you are interested you could look this up. To learn more go to: https://pubs.usgs.gov/info/loess/
This is the original art work by Robert Culver, aka The Nebraska Kid, drawn in 1975 as a t-shirt design. It is part of his one man show at the Modern Art Midtown gallery in Omaha, Nebraska. To see his contemporary work go to: http://www.modernartsmidtown.com/artists/Bob%20Culver