Temporary Drawings on Sand and Ice
Large proportion landscape art by Jim Denevan.
Notes about the artist (from Wikipedia):
Jim Denevan (born 1961) is an American artist who creates temporary land art. He works with natural materials to create massive scale drawings in sand, ice, and soil. His sculptures are not placed in the landscape, rather, the landscape is the means of their creation. Often aerial photography or video is needed to comprehend the final work.
Below: Drawings on sand.
Below: Circular etchings on the surface of frozen Lake Baikal in Siberia, Russia.
Link via Planet Oddity