A very good article from WineFolly.com with infographics on the appellation systems in the United States, France, Italy, and Spain. This is the kind of helpful information that wine buyers need to help decide what to purchase, especially when you are looking at wines with which you are not familiar. There are “click-throughs” to other information as well.
The Spanish Wine Map below is one example from the article (click on it in the article and you go to another excellent article about Spanish Wine).