Sudan, officially the Republic of the Sudan, is a country in Northeast Africa. It borders the Central African Republic to the southwest, Chad to the west, Egypt to the north, Eritrea to the northeast, Ethiopia to the southeast, Libya to the northwest, South Sudan to the south, and the Red Sea. It has a population of 45.7 million people as of 2022 and occupies 1,886,068 square kilometres, making it Africa's third-largest country by area and the third-largest by area in the Arab League. It was the largest country by area in Africa and the Arab League until the secession of South Sudan in 2011; since then both titles have been held by Algeria. Its capital and most populous city is Khartoum.

The Central African Republic (CAR), formerly known as Ubangi-Shari, is a landlocked country in Central Africa. It is bordered by Chad to the north, Sudan to the northeast, South Sudan to the east, the Democratic Republic of the Congo to the south, the Republic of the Congo to the southwest, and Cameroon to the west. Bangui is the country's capital and largest city, at the border with the Democratic Republic of the Congo. The Central African Republic covers a land area of about 620,000 square kilometres (240,000 sq mi). As of 2021, it had an estimated population of around 5.5 million. As of 2024, the Central African Republic is the scene of a civil war, which has been ongoing since 2012.