The term 'Mirage Site' is a crossword solution that consists of two words: 'DESERT' and '6 letters'. The term 'Mirage Site' refers to an area in the DESERT where a mirage appears due to the refraction of light. A mirage is an optical illusion caused by atmospheric conditions, which makes it appear as if there is a pool of water in the DESERT. This phenomenon is often seen in hot, arid regions, such as the Sahara DESERT.