What are the region's "physical geography" of Santorini Greece. describe how the physical terrain formed, considerations for water resources, climate and weather, or other aspect of the physical environment. For example, how the sandy beaches of the Caribbean formed from the calcium carbonate reef systems, giving the islands their characteristic soft sandy beaches. I would summarize how those sands formed at those particular locations (e.g. reef systems in the tropics, erosion and wave action for sand formation, etc.) in order to ensure academic content - "why" that topic is location-specific.