This useful interactive infographic from The Guardian delineates the relationships between a variety of actors within and without the Middle East. By highlighting on a nation or group, a user can see which other actors are strong allies, strong enemies, or in between. This interactive infographic also designates which nations or groups are predominantly Sunni, Shi'a, or neither. Since this is not exhaustive (for example, it does not indicate a relationship between the U.S. and Turkey), it can be also used as a starting point for students to research unspecified relationships.