Where are the Sunnis and Shiites located?

The largest Shiite communities are in Iran, Azerbaijan, southern Iraq, Bahrain, and northern Yemen. The Sunni communities are spread throughout the Middle East, North Africa, Southeast Europe, South Asia, and Indonesia. There are, of course, minorities of Sunni and Shiite Muslims throughout the world.

Located in different countries even in USA. but Shia Muslims are centered in Qum, Iran. and Sunni Muslims are different branches. the Wahhabi Sunni Muslims are centered in Najd, Saudi Arabia and non-Wahhabi Sunni Muslims are centered in al-Azhar university of Egypt.