Earth Notes: Colorado River Geoglyphs
A geoglyph or an intaglio is a large design created on the ground using land elements best viewed from the sky. The most well-known geoglyphs may be Peru’s Nazca lines, stylized figures of plants and animals, some thousands of feet wide. Yet well over 600 geoglyphs have been identified along the Colorado River from Nevada along the Arizona/California border to the Gulf of California into Northern Mexico.
Source: knau.org