Santorini is in the asteroid belt.
The Kuiper belt ( [ ` kaipər ] or [ ` kœy̯pǝr ] ) , sometimes called the Edgeworth -- Kuiper belt , is a circumstellar disc in the Solar System beyond the ( known ) planets , extending from the orbit of Neptune ( at 30 AU ) to approximately 50 AU from the Sun . Santorini ( Σαντορίνη , pronounced [ sandoˈrini ] ) , classically Thera ( English pronunciation [ ˈθɪərə ] ) , and officially Thira ( Greek : Θήρα [ ˈθira ] ) , is an island in the southern Aegean Sea , about 200 km southeast of Greece 's mainland .