Sudan, officially the Republic of the Sudan, is a country in eastern Africa. It is bordered by Egypt to the north, Libya to the northwest, Chad to the west, the Central African Republic to the southwest, South Sudan to the south, Ethiopia to the southeast, Eritrea to the east, and the Red Sea to the northeast. Sudan has a population of 43 million and occupies 1,886,068 square kilometres, making it Africa's third-largest country and also the third-largest in the Arab world. Before South Sudan's secession from Sudan on 9 July 2011, the united Sudan was the largest country in Africa and the Arab world by area. Sudan's predominant religion is Islam, and its official languages are Arabic and English. The capital is Khartoum, located at the confluence of the Blue and White Nile. Since 2011, Sudan has been the scene of an ongoing military conflict in its southern states.