Image from Google Maps: a geoglyph near the Titicaca Lake, Peru. This image shows a plain area covered by a network of waru-warus, that is, of the "raised fields" - earthworks separated by canals - near the Titicaca Lake. This is an ancient agricultural technique used by Andean people starting from the first millennium BC. Note that the structure of the network is created after a careful planning. Each raised field is approximately 10 meters large and more than one hundred long.
"A jetty arm of fill dirt and rock extends into the Great Salt Lake where it curls into a tight circular spiral. Built when the lake was unusually low, it has only been above water level a few times since it was built."