Illustrations: engraved line art generated from the photograph below (Dispatch scripts/engrave.ts), via Wikimedia Commons.

Medanos de Coro. Photo by Rjcastillo, CC BY-SA 3.0 (the illustration is shared under the same license)
  https://commons.wikimedia.org/wiki/File:Medanos_de_Coro_III.jpg
  https://creativecommons.org/licenses/by-sa/3.0/