The Oreads (Greek: Oreiades ) are nymphs in Greek mythology. In contrast to the Naiads (water nymphs) and Dryads ( tree nymphs) are mountain nymphs (Greek: ὄρος = mountain ). They live in caves, forests and mountains. One of the most famous Oreads is echo. The goddess Hera robbed her of speech and made ​​her only the ability to repeat the last words addressed to it.