Most lines run straight across the landscape, but there are also figurative designs of animals and plants, made up of lines. The individual figurative geoglyph designs measure between 0. 4 and 1. 1 km (. 2 and . 7 mi) across. The combined length of all the lines is over 1,300 km (808 mi), and the group cover an area of about 50 sq km (19 sq mi). The lines are typically 10 to 15 cm (4 to 6 in) deep. They were made by removing the top layer of reddish-brown iron oxide-coated pebbles to reveal a yellow-grey subsoil. The width of the lines varies considerably, but over half are slightly over one-third meter (just over 1 foot) wide. In some places they may be only a foot (30. 5 cm) wide, and in others reach 6 feet (1. 8 m) wide.