Lake Tana in the context of "Nile Valley"

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.

The Blue Nile is a river originating at Lake Tana in Ethiopia. It travels for approximately 1,450 km (900 mi) through Ethiopia and Sudan. Along with the White Nile, it is one of the two major tributaries of the Nile and supplies about 85.6% of the water to the Nile during the rainy season.
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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").

The Butana (Arabic: البطانة, Buṭāna), historically called the Island of Meroë, is the region between the Atbara and the Nile in the Sudan. South of Khartoum it is bordered by the Blue Nile and in the east by Lake Tana in Ethiopia. It should not be confused with the Gezira, the region west of the Blue Nile and east of the White Nile.

Geological characteristics of the Butana are sandy and stony soils, light non-cracking clay, and dark cracking clay; the superficial clays cover over 70% of the plain. Although there are very limited water resources, seasonal surface water wells and a few deep bore wells are present. A tropical continental climate provides rain in the southern section of the plain. Two vegetation zones feature a semi-desert Acacia shrub, short grasslands, and a low woodland savannah.

The Atbarah River (Arabic: نهر عطبرة; transliterated: Nahr 'Atbarah), also referred to as the Red Nile and / or Black Nile, is a river in northeast Africa. It rises in northwest Ethiopia, approximately 50 km north of Lake Tana and 30 km west of Gondar. It then flows about 805 km (500 mi) to the Nile in north-central Sudan, joining it at the city of Atbarah (17°40′37″N 33°58′12″E / 17.677°N 33.970°E / 17.677; 33.970). The river's tributary, the Tekezé (Setit) River, is perhaps the true upper course of the Atbarah, as the Tekezé follows the longer course prior to the confluence of the two rivers (at 14° 10' N, 36° E) in northeastern Sudan. The Atbarah is the last tributary of the Nile before it reaches the Mediterranean.

For much of the year, it is little more than a stream. However, during the rainy season (generally July to October), the Atbarah rises some 18 ft (5 m) above its normal level. At this time, it forms a formidable barrier between the northern and central districts of the Amhara Region of Ethiopia. Besides the Tekezé, other important tributaries of the Atbarah include the Shinfa River which rises west of Lake Tana, and the Greater Angereb which has its source north of the city of Gondar.

The Amhara Region (Amharic: አማራ ክልል, romanized: Åmara Kilil), officially the Amhara National Regional State (Amharic: የአማራ ብሔራዊ ክልላዊ መንግሥት), is a regional state in northern Ethiopia and the homeland of the Amhara, Awi, Argobba, and Qemant people. Its capital is Bahir Dar which is the seat of the Regional Government of Amhara. Amhara is the site of the largest inland body of water in Ethiopia, Lake Tana (which is the source of the Blue Nile), Grand Renaissance Dam and Semien Mountains National Park (which includes Ras Dashan, the highest point in Ethiopia). Amhara is bordered by Sudan to the west and northwest and by these regions of Ethiopia: Tigray to the north, Afar to the east, Gambela region to southwest, and Gurage to the south. Towns and cities in Amhara include: Dessie, Gonder, Debre Birhan, Debre Tabor, Kombolcha, Weldiya, Debre Markos, Seqota, Kobo, and Metema.

The Gilgel Abay (Amharic: ግልገል አባይ, Gǝlgäl Abbay), or Lesser Abay, is a river of central Ethiopia. Rising in the mountains of Gojjam, it flows northward to empty into south-western Lake Tana in a bird's-foot delta. Tributaries of the Gilgel Abbay include the Ashar, Jamma, Kelti and the Koger. It was regarded as the true source of the Nile for a long time and the Jesuit priest Pedro Paez visited it in 1618. The name Gilgel Abbay means Lesser Nile, as Abbay is the name for the Blue Nile.