Cydonia is a region on the planet Mars known for its unique geological features, including large mesas and valleys. It gained significant attention in the 1970s when images from the Viking 1 spacecraft revealed a formation resembling a human face, sparking interest and speculation about possible ancient civilizations on Mars. The Cydonia region covers an area of about 3,000 square kilometers and includes various formations, such as the "Face on Mars" and the "D&M Pyramid." Subsequent missions, including those by the Mars Reconnaissance Orbiter, have provided clearer images, showing that these formations are natural geological structures rather than artificial constructs.