There are eleven RSCs in the world with three main categories. The main criterion in establishing those categories is the number of great powers located in each RSC. Three of those categories are called centered (North America, the CIS, and the EU-Europe), one is a great power complex (East Asia), and the remaining seven are standard (South America, South Asia, the Middle East, the Horn of Africa, West Africa, Central Africa, and Southern Africa). There is only one great power in the centered RSC, more than one power in the great power RSC, and no great power in the standard RSC.