[bobdvb]

Agreed, if you can find the name of the exact location on the bottle then you are probably protected under a European PDO. Kalamata is an island famed for the quality of its olives. In the UK I buy Iliada oil from the supermarket, it is a good quality Greek olive oil that is one of the most popular brands in Greece (not just a made up brand for export).

Remember that each oil has its own smoke point and you shouldn't take Olive oil to it's smoke point. If you need to cook with smoking oil (some Asian cooking) then you need a different oil. I once saw a chart of which oils were best for different uses but I can't find it now.