Giant Prickly Pear Cactus (Opuntia cacti) on South Plaza, Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

galapagos islands cactus prickly pear cacti plant vegetation desert arid landscape nature environment ecosystem wildlife flora fauna geology rocks stones grass green brown blue sky clouds sunny day light outdoor travel tourism adventure exploration scenery beautiful amazing wonder marvel unique special endangered endemic rare tropical equatorial south america ecuador conservation protect preservation