Blue Nile in the context of "Nubia"

The geography of North Africa has been reasonably well known among Europeans since classical antiquity in Greco-Roman geography. Northwest Africa (the Maghreb) was known as either Libya or Africa, while Egypt was considered part of Asia.

European exploration of sub-Saharan Africa begins with the Age of Discovery in the 15th century, pioneered by the Kingdom of Portugal under Henry the Navigator. The Cape of Good Hope was first reached by Bartolomeu Dias on 12 March 1488, opening the important sea route to India and the Far East, but European exploration of Africa itself remained very limited during the 16th and 17th centuries. The European powers were content to establish trading posts along the coast while they were actively exploring and colonizing the New World. Exploration of the interior of Africa was thus mostly left to the Muslim slave traders, who in tandem with the Muslim conquest of Sudan established far-reaching networks and supported the economy of a number of Sahelian kingdoms during the 15th to 18th centuries.

The Nile (also known as the Nile River or River Nile) is an important river in Africa that flows northwards into the Mediterranean Sea. At roughly 6,650 km (4,130 mi) long, it is among the longest rivers in the world. Its drainage basin covers eleven countries: the Democratic Republic of the Congo, Tanzania, Burundi, Rwanda, Uganda, Kenya, Ethiopia, Eritrea, South Sudan, Sudan, and Egypt. It plays an important economic role in the economy of these nations, and it is the primary water source for South Sudan, Sudan and Egypt.

The Nile has two major tributaries: the White Nile and the Blue Nile. The White Nile, being the longer, is traditionally considered to be the headwaters, while the Blue Nile actually contributes 80% of the water and silt below the confluence of the two. The White Nile begins at Lake Victoria and flows through Uganda and South Sudan, while the Blue Nile begins at Lake Tana in Ethiopia and flows into Sudan from the southeast. The two rivers meet at the Sudanese capital of Khartoum.

Meroë (/ˈmɛroʊiː/; also spelled Meroe; Meroitic: 𐦨𐦡𐦷𐦡𐦥𐦢, romanized: Medewi; Arabic: مرواه, romanized: Meruwah and مروي, Meruwi; Ancient Greek: Μερόη, romanized: Meróē) was an ancient city on the east bank of the Nile about 6 km north-east of the Kabushiya station near Shendi, Sudan, approximately 200 km north-east of Khartoum. Near the site is a group of villages called Bagrawiyah (Arabic: البجراوية). This city was the capital of the Kingdom of Kush for several centuries from around 590 BC, until its collapse in the 4th century AD. The Kushitic Kingdom of Meroë gave its name to the "Island of Meroë", which was the modern region of Butana, a region bounded by the Nile (from the Atbarah River to Khartoum), the Atbarah and the Blue Nile.

The city of Meroë was on the edge of Butana. There were two other Meroitic cities in Butana: Musawwarat es-Sufra and Naqa. The first of these sites was given the name Meroë by the Persian king Cambyses, in honor of his sister who was called by that name. The city had originally borne the ancient appellation Saba, named after the country's original founder. The eponym Saba, or Seba, is named for one of the sons of Cush (see Genesis 10:7). The presence of numerous Meroitic sites within the western Butana region and on the border of Butana proper is significant to the settlement of the core of the developed region. The orientation of these settlements exhibit the exercise of state power over subsistence production.

The White Nile (Arabic: النيل الأبيض an-nīl al-'abyaḍ) is a river in North and East Africa, the minor of the two main tributaries of the Nile, the larger being the Blue Nile. The name "White" comes from the clay sediment carried in the water that changes the water to a pale color.

In the strict meaning, "White Nile" refers to the river formed at Lake No, at the confluence of the Bahr al Jabal and Bahr el Ghazal Rivers. In the wider sense, "White Nile" refers to all the stretches of river draining from Lake Victoria through to the merger with the Blue Nile: the "Victoria Nile" from Lake Victoria via Lake Kyoga to Lake Albert, then the "Albert Nile" to the South Sudan border, and then the "Mountain Nile" or "Bahr-al-Jabal" down to Lake No. "White Nile" may sometimes include the headwaters of Lake Victoria, the most remote of which being 3,700 km (2,300 mi) from the Blue Nile.

Lake Tana (Amharic: ጣና ሐይቅ, romanized: T’ana ḥāyik’i; previously transcribed Tsana) is the largest lake in Ethiopia and a source of the Blue Nile. Located in Amhara Region in the north-western Ethiopian Highlands, the lake is approximately 84 kilometres (52 miles) long and 66 kilometres (41 miles) wide, with a maximum depth of 15 metres (49 feet), and an elevation of 1,788 metres (5,866 feet). Lake Tana is fed by the Gilgel Abay, Reb and Gumara rivers. Its surface area ranges from 3,000 to 3,500 square kilometres (1,200 to 1,400 square miles), depending on season and rainfall. The lake level has been regulated since the construction of the control weir where the lake discharges into the Blue Nile. This controls the flow to the Blue Nile Falls (Tis Abbai) and hydro-power station.

In 2015, the Lake Tana region was nominated as a UNESCO Biosphere Reserve recognizing its national and international natural and cultural importance.

Khartoum, also spelled Khartum, is the capital city of Sudan as well as Khartoum State. With an estimated population of 7.1 million people, Greater Khartoum is the largest urban area in Sudan.

Khartoum is located at the confluence of the White Nile – flowing north from Lake Victoria – and the Blue Nile, flowing west from Lake Tana in Ethiopia. Divided by these two parts of the Nile, the Khartoum metropolitan area is a tripartite metropolis consisting of Khartoum proper and linked by bridges to Khartoum North (الخرطوم بحري al-Kharṭūm Baḥrī) and Omdurman (أم درمان Umm Durmān) to the west. The place where the two Niles meet is known as al-Mogran or al-Muqran (المقرن; English: "The Confluence").

Alodia, also known as Alwa (Greek: Αρουα, Aroua; Arabic: علوة, ʿAlwa), was a medieval kingdom in what is now central Sudan. Its capital was the city of Soba, located near modern-day Khartoum at the confluence of the Blue and White Nile rivers.

Founded sometime after the ancient Kingdom of Kush fell, around 350 AD, Alodia is first mentioned in historical records in 569. It was the last of the three Nubian kingdoms to convert to Christianity in 580, following Nobadia and Makuria. It possibly reached its peak during the 9th–12th centuries when records show that it exceeded its northern neighbor, Makuria, with which it maintained close dynastic ties, in size, military power and economic prosperity. Alodia was a large, multicultural state administered by a powerful king and provincial governors appointed by him. The capital Soba, described as a town of "extensive dwellings and churches full of gold and gardens", prospered as a trading hub. Goods arrived from Makuria, the Middle East, western Africa, India and even China. Literacy in both Nubian and Greek flourished.