The Kalamata olive is a large, dark brown olive with a smooth, meaty texture, named after the city of Kalamata in the southern Peloponnese, Greece.Often used as table olives, they are usually preserved in wine vinegar or olive oil. Typically the term "Kalamata" legally refers to a region of Greece where these olives are grown, however a few countries use the name for such olives grown anywhere, even outside of Greece.
lean more on Wikipedia