1. Santorini, classically Thera, and officially Thira, is an island in the southern Aegean Sea, about 200 km southeast of Greece's mainland.Wikipedia 
4. Area: 90.96 km²
5. Max length: 18 km
6. Max width: 12 km

Seljalandsfoss is a waterfall in Iceland. It was a waypoint during the first leg of The Amazing Race 6. Seljalandsfoss is situated between Selfoss and Skógafoss, where Route 1 meets the track going to Þórsmörk.Wikipedia 

We should visit this place in the near future!