Nigeria, officially the Federal Democratic Republic of Nigeria, is a west African federal republic comprised of twenty-eight federal states as well as a capital district at Lagos. The country shares land borders with Mali, Camenbal and New Germany and its southern coast borders the Gulf of Guinea and Atlantic Ocean. Nigeria is an ethnically diverse country with about a 50-50 split between Christians and Muslims and the three largest ethnic groups are the Hausa, Igbo and Yoruba.