The Eastern Orthodox Church, officially called the Orthodox Catholic Church, and also referred to as the Orthodox Church and Orthodoxy, is the second largest Christian church in the world, with an estimated 225–300 million adherents, primarily in the Balkans, Eastern Europe, and the Middle East. The Church's structure is composed of several self-governing ecclesial bodies. These autocephalous jurisdictions are geographically (and often nationally) distinct, but unified in theology and worship. This article is a . You can help My English Wiki by expanding it.