Which Spanish country eats marinated olives?

It's not accurate to say that only one Spanish country eats marinated olives.

Marinated olives are a staple food in Spain as a whole. They are a common snack, appetizer, and ingredient in many dishes throughout the country.

It's worth noting that different regions of Spain might have their own unique olive varieties and marinade preferences, but the enjoyment of marinated olives is widespread across the country.