Shia Crescent & Sunni Crescent

The Shia Crescent is the crescent-shaped region of the Middle East where the majority population is Shi'a, or where there is a strong Shi'a minority in the population. This term was coined byAbdullah II, king of Jordan, after which it became popular in political debates. References to the Shia Crescent are often made with the belief that the common religion gives good potential for cooperation. The countries included in this are Iran, Iraq, Syria, Lebanon and Azerbaijan. 



Corrrespondingly  there is a “Sunni Crescent” led by Turkey, Saudi Arabia, Qatar and the United Arab Emirates. 
In West Asian politics a new trend of increasingly ugly regional geopolitics is evident between the Shia and Sunni Crescents. 2

Sources:
1. http://en.wikipedia.org/wiki/Shia_Crescent
2. http://chellaney.net/2012/02/18/arab-spring-hijacked/