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Egypt's Geography & Weather

Geography 
 
 
The geography of Egypt relates to two regions: North Africa and Southwest Asia.
 
Egypt has coastlines on both the Mediterranean Sea and the Red Sea. The country borders Libya to the west, the Gaza Strip and Israel to the east, and Sudan to the south. Covering 1,001,449 km2 (38,6662 mi2), Egypt has a land area about the same as that of Texas and New Mexico combined, four times bigger than that of the United Kingdom, twice as big as that of France, and three times bigger than Germany. The longest straight-line distance in Egypt from north to south is 1,024 km (636 mi), while that from east to west measures 1,240 km (771 mi). More than 2,900 km (1800 mi) of coastline on the Mediterranean Sea, the Gulf of Suez, the Gulf of Aqaba, and the Red Sea constitute Egypt's maritime boundaries.
 
 
 
 
Governorates
 
Egypt is divided into twenty-seven governorates (sometimes called provinces), which include four city governorates: Alexandria (Al Iskandariyah), Cairo (Al Qahirah), Port Said (Bur Said) and Suez. Also included are the nine governorates of Lower Egypt in the Nile Delta region, the eight governorates of Upper Egypt along the Nile River south from Cairo to Aswan, and the five frontier governorates covering Sinai and the deserts that lie west and east of the Nile.
 
Natural regions
 
Egypt is predominantly desert. Only 35,000 km2 - 3.5% - of the total land area is cultivated and permanently settled. Most of the country lies within the wide band of desert that stretches eastwards from Africa's Atlantic Coast across the continent and into southwest Asia.
 
Egypt's geological history has produced four major physical regions:
 
Nile Valley and Nile Delta
Western Desert (also known as the Libyan Desert)
Eastern Desert (extends from the Nile Valley all the way to the Red Sea coast)
Sinai Peninsula
Despite covering only about 5.5% of the total area of Egypt, the Nile Valley and Nile Delta are the most important regions, being the country's only cultivable regions and supporting about 99% of the population. The Nile valley extends approximately 800 km from Aswan to the outskirts of Cairo. The Nile Valley is very cool and known as Upper Egypt, while the Nile Delta region is known as Lower Egypt. Steep rocky cliffs rise along the banks of the Nile in some stretches, while other areas along the Nile are flat, with space for agricultural production. In the past, flooding of the Nile during the summer provided silt and water to make agriculture possible on land that is otherwise very dry. Since construction of the Aswan Dam, agriculture in the Nile valley depends on irrigation. The Nile delta consists of flat, low-lying areas. Some parts of the delta are marshy and water-logged, and thus not suitable for agriculture. Other areas of the delta are used for agriculture.[1]
 
 
 
 
 
 
Nile Valley and Delta
 
The Nile Valley and Delta, the most extensive oasis on earth, was created by the world's longest river and its seemingly inexhaustible sources. Without the topographic channel that permits the Nile to flow across the Sahara, Egypt would be entirely desert. The length within Egypt of the River Nile in its northwards course from three central African sources – the White Nile, the Blue Nile, and the Atbara – totals some 1,600 km.
 
The White Nile, which begins at Lake Victoria in Uganda, supplies about 28% of the Nile's Egyptian waters. In its course from Lake Victoria to Juba in southern Sudan, the White Nile's channel drops more than 600 m. In its 1,600-km course from Juba to Khartoum, Sudan's capital, the river descends just 75 m. In southern and central Sudan, the White Nile passes through a wide, flat plain covered with swamp vegetation and slows almost to the point of stagnation.
 
The Blue Nile, which originates at Lake Tana in Ethiopia, provides on average some 58% of the Nile's Egyptian waters. This river has a steeper gradient and therefore flows more swiftly than the White Nile, which it joins at Khartoum. Unlike the White Nile, the Blue Nile carries a considerable amount of sediment. For several kilometres north of Khartoum, water closer to the eastern bank of the river, coming from the Blue Nile, is visibly muddy, while that closer to the western bank, and coming from the White Nile, is clearer.
 
The much shorter Atbara River, which also originates in Ethiopia, joins the main Nile north of Khartoum between the fifth and sixth cataracts (areas of steep rapids) and provides about 14% of the Nile's waters in Egypt. During the low-water season, which runs from January to June, the Atbarah shrinks to a number of pools. But, in late-summer, when torrential rains fall on the Ethiopian plateau, the Atbarah provides 22% of the Nile's flow.
 
The Blue Nile has a similar pattern. It contributes 17% of the Nile's waters in the low-water season and 68% during the high-water season. In contrast, the White Nile provides only 10% of the Nile's waters during the high-water season but contributes more than 80% during the low-water period. Thus, before the Aswan High Dam was completed in 1971, the White Nile watered the Egyptian stretch of the river throughout the year, whereas the Blue Nile, carrying seasonal rain from Ethiopia, caused the Nile to overflow its banks and deposit a layer of fertile mud over adjacent fields. The great flood of the main Nile usually occurred in Egypt during August, September, and October, but it sometimes began as early as June at Aswan and often did not completely wane until January.
 
The Nile enters Egypt a few kilometres north of Wadi Halfa, a Sudanese town that was completely rebuilt on high ground when its original site was submerged in the reservoir created by the Aswan High Dam. As a result of the dam's construction, the Nile actually begins its flow into Egypt as Lake Nasser, which extends southwards from the dam for 320 km to the border and for an additional 158 km within Sudan. Lake Nasser's waters fill the area through Lower Nubia (Upper Egypt and northern Sudan) within the narrow canyon between the cliffs of sandstone and granite created by the flow of the river over many centuries. Below Aswan the cultivated floodplain strip widens to as much as twenty km. North of Isna (160 km north of Aswan), the plateau on both sides of the valley rises to as much as 550 m above sea level; at Qina (some 90 km north of Isna) the 300-m limestone cliffs force the Nile to change course towards the southwest for about 60 km before it turns northwest for about 160 km to Asyut. Northward from Asyut, the escarpments on both sides diminish, and the valley widens to a maximum of 22 km.
 
At Cairo, the Nile spreads out over what was once a broad estuary, subsequently filled by silt deposits to form what is now a fertile, fan-shaped delta some 250 km wide at its seaward extremity and extending about 160 km from north to south. The Nile Delta covers approximately 22,000 km2 (roughly equivalent in area to that of Massachusetts). According to historical accounts from the first century AD, seven branches of the Nile once ran through the delta. According to later accounts, the Nile had, by around the twelfth century, just six branches. Since then, nature and man have closed all but two main outlets: the east branch, Damietta (also seen as Dumyat; 240 km long), and the west branch, Rosetta (235 km long). Both outlets are named after the ports located at their respective mouths. A network of drainage and irrigation canals supplements these remaining outlets. In the north, near the coast, the Nile delta embraces a series of salt marshes and lakes, the most notable among which are Idku, Al Burullus, and Manzilah.
 
The fertility and productivity of the land adjacent to the Nile depends largely on the silt deposited by floodwaters. Archaeological research indicates that people once lived at a much higher elevation along the river than they do today, probably because the river was higher or the floods more severe. The timing and the amount of annual flow were always unpredictable. Measurements of annual flows as low as 1.2 billion m3 and as high as 4.25 billion m3 have been recorded. For centuries Egyptians attempted to predict and take advantage of these flows and thereby moderate the severity of floods.
 
The construction of dams on the Nile, particularly the Aswan High Dam, transformed the mighty river into a large and predictable irrigation ditch. Lake Nasser, the world's largest artificial lake, has enabled planned use of the Nile regardless of the amount of rainfall in Central Africa and East Africa. The dams have also affected the Nile Valley's fertility, which was dependent for centuries not only on the water brought to the arable land but also on the materials left by the water. Researchers have estimated that beneficial silt deposits in the valley began about 10,000 years ago. The average annual deposit of arable soil through the course of the river valley amounted to some nine metres. Analysis of the flow revealed that 10.7 million tons of solid matter passed Cairo each year. Today the Aswan High Dam obstructs most of this sediment, now retained in Lake Nasser. The reduction in annual silt deposits has contributed to rising water tables and increasing soil salinity in the Delta, the erosion of the river's banks in Upper Egypt, and the erosion of the alluvial fan along the shore of the Mediterranean Sea.
 
 
Western Desert
 
The Western Desert covers an area of some 700,000 km2, thereby accounting for around two-thirds of Egypt's total land area. This immense desert to the west of the Nile spans the area from the Mediterranean Sea southwards to the Sudanese border. The desert's Jilf al Kabir Plateau, at a mean altitude of some 1000 m, constitutes an exception to the uninterrupted territory of basement rocks covered by layers of horizontally bedded sediments forming a massive plain or low plateau. The Great Sand Sea lies within the desert's plain and extends from the Siwa Oasis to Jilf al Kabir. Escarpments (ridges) and deep depressions (basins) exist in several parts of the Western Desert, and no rivers or streams drain into or out of the area.
 
The government has considered the Western Desert a frontier region and has divided it into two governorates at about the twenty-eighth parallel: Matruh to the north and New Valley (Al Wadi al Jadid) to the south. There are seven important depressions in the Western Desert, and all are considered oases except the largest, Qattara, the water of which is salty. The Qattara Depression, which includes the country's lowest point, encompasses 19,605 square kilometers (7,570 sq mi), which is similar to the size of Lake Ontario. It is largely below sea level and is 133 meters (436 ft) below sea level at the lowest. Badlands, salt marshes, and salt lakes cover the sparsely inhabited Qattara Depression.
 
Limited agricultural production, the presence of some natural resources, and permanent settlements are found in the other six depressions, all of which have fresh water provided by the Nile or by local groundwater. The Siwah Oasis, close to the Libyan border and west of Qattara, is isolated from the rest of Egypt but has sustained life since ancient times. The Siwa's cliff-hung Temple of Amun was renowned for its oracles for more than 1,000 years. Herodotus and Alexander the Great were among the many illustrious people who visited the temple in the pre-Christian era.
 
The other major oases form a topographic chain of basins extending from the Faiyum Oasis (sometimes called the Fayyum Depression) which lies 60 kilometers (37 mi) southwest of Cairo, south to the Bahariya, Farafirah, and Dakhilah oases before reaching the country's largest oasis, Kharijah. A brackish lake, Birket Qarun, at the northern reaches of Al Fayyum Oasis, drained into the Nile in ancient times. For centuries sweetwater artesian wells in the Fayyum Oasis have permitted extensive cultivation in an irrigated area that extends over 1,800 square kilometers (695 sq mi).
 
 
Eastern Desert
 
The topographic features of the desert region east of the Nile differ from those to the west of the Nile. The Eastern Desert is relatively mountainous. The elevation rises abruptly from the Nile, and an downward-sloping plateau of sand gives way within 100 km to arid, defoliated, rocky hills running north and south between the Sudan border and the Delta. The hills reach elevations of more than 1,900 m. The region's most prominent feature is the easterly chain of rugged mountains, the Red Sea Hills, which extend from the Nile Valley eastward to the Gulf of Suez and the Red Sea. This elevated region has a natural drainage pattern that rarely functions because of insufficient rainfall. It also has a complex of irregular, sharply cut wadis that extend westward toward the Nile. The desert environment extends all the way to the Red Sea coast.
 
 
Sinai Peninsula
 
 
The Sinai Peninsula is a triangular-shaped peninsula, about 61,100 km2 in area (slightly smaller than the U.S. state of West Virginia). Similar to the desert, the peninsula contains mountains in its southern sector that are a geological extension of the Red Sea Hills, the low range along the Red Sea coast that includes Mount Catherine (Jabal Katrinah), the country's highest point, at 2,642 m above sea-level. The Red Sea may have been named after these mountains, which are red.
 
The southern side of the peninsula has a sharp escarpment that subsides after a narrow coastal shelf that slopes into the Red Sea and the Gulf of Aqaba. The elevation of Sinai's southern rim is about 1,000 m. Moving northward, the elevation of this limestone plateau decreases. The northern third of Sinai is a flat, sandy coastal plain, which extends from the Suez Canal into the Gaza Strip and Israel.
 
Before the Israeli military occupied Sinai during the June 1967 War (Arab-Israeli war, also known as the Six-Day War), a single Egyptian governorate administered the whole peninsula. By 1982 after all of Sinai was returned to Egypt, the central government divided the peninsula into two governorates. North Sinai has its capital at Al Arish and the South Sinai has its capital in Artt Turkishy.
 
 
Climate of Egypt
 
Egypt essentially has a hot desert climate (Köppen climate classification BWh). The climate is generally extremely dry all over the country except on the northern Mediterranean coastwhich receives more rainfall in winter. In addition to rarity of rain, extreme heat during summer months is also a general climate feature of Egypt although daytime temperature are obviously more moderated along the northern coast.
The prevailing winds from the Mediterranean Sea continuously blow over the northern coast without the interposition of an eventual mountain range and thus, greatly moderate temperatures throughout the year. Because of this effect, averages low temperature vary from 9.5 °C (49.1 °F) during wintertime to 23 °C (73.4 °F) to summertime and averages high temperatures vary from 17 °C (62.6 °F) during wintertime to 32 °C (89.6 °F) in summertime. Though temperatures are moderated along the coasts, the situation changes very much farther in the interior of the country where the prevailing northerly winds aren't felt anymore. Thus, in the central and the southern parts, daytime temperatures are hotter especially in summers where averages high temperatures easily soar over 40 °C (104 °F) in cities and places such as Aswan, Luxor, Asyut or Sohag which are located in the deserts of Egypt. Some mountainous locations in Sinai, such as Saint Catherine, have cooler night temperatures more than any other location, because of their high elevation.
Every year, sometime from March to May, an extremely hot, dry and dusty wind blows from the south or the southwest. This wind is calledkhamasīn. When the flow of dry air continuously blows over vast desert regions, it picks up fine sand and dust particles and finally results in a dusty wind which is generally felt in the periphery of the desert. When this wind blows over Egypt, it causes high temperatures to soar temporarily at dangerous levels, usually over 45 °C (113 °F), the relative humidity levels to drop under 5%. The khamasīn causes sudden, early heat waves and the absolute highest temperature records in Egypt.
Egypt receives between 200 mm (7.87 in) and 20 mm (0.79 in) of annual average precipitation along the narrow Mediterranean coast, but south to Cairo, the average drastically drops to reach nearly 0 mm (0.00 in) in the central and the southern part of the country. The cloudiest rainiest places are in and around Alexandria and Rafah. The sunshine duration is also extremely high all over Egypt, ranging from a "low" of 3,300 hours along the northernmost part in places such as Alexandria to reach a high of over 4,000 hours farther in the interior, in most of the country.
 
 

[hide]Climate data for Cairo

Month

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Year

Record high °C (°F)

31
(88)

34.2
(93.6)

37.9
(100.2)

43.2
(109.8)

47.8
(118)

46.4
(115.5)

42.6
(108.7)

43.4
(110.1)

43.7
(110.7)

41
(106)

37.4
(99.3)

30.2
(86.4)

47.8
(118)

Average high °C (°F)

18.9
(66)

20.4
(68.7)

23.5
(74.3)

28.3
(82.9)

32
(90)

33.9
(93)

34.7
(94.5)

34.2
(93.6)

32.6
(90.7)

29.2
(84.6)

24.8
(76.6)

20.3
(68.5)

27.7
(81.9)

Daily mean °C (°F)

13.6
(56.5)

14.9
(58.8)

16.9
(62.4)

21.2
(70.2)

24.5
(76.1)

27.3
(81.1)

27.6
(81.7)

27.4
(81.3)

26
(79)

23.3
(73.9)

18.9
(66)

15
(59)

21.38
(70.5)

Average low °C (°F)

9
(48)

9.7
(49.5)

11.6
(52.9)

14.6
(58.3)

17.7
(63.9)

20.1
(68.2)

22
(72)

22.1
(71.8)

20.5
(68.9)

17.4
(63.3)

14.1
(57.4)

10.4
(50.7)

15.8
(60.4)

Record low °C (°F)

1.2
(34.2)

3.6
(38.5)

5
(41)

7.6
(45.7)

12.3
(54.1)

16
(61)

18.2
(64.8)

19
(66)

14.5
(58.1)

12.3
(54.1)

5.2
(41.4)

3
(37)

1.2
(34.2)

Precipitation mm (inches)

5
(0.2)

3.8
(0.15)

3.8
(0.15)

1.1
(0.043)

0.5
(0.02)

0.1
(0.004)

0
(0)

0
(0)

0
(0)

0.7
(0.028)

3.8
(0.15)

5.9
(0.232)

24.7
(0.972)

Avg. precipitation days (≥ 0.01 mm)

3.5

2.7

1.9

0.9

0.5

0.1

0

0

0

0.5

1.3

2.8

14.2

 % humidity

59

54

53

47

46

49

58

61

60

60

61

61

56

Mean monthly sunshine hours

213

234

269

291

324

357

363

351

311

292

248

198

3,451

Source #1: World Meteorological Organization (UN) (1971–2000),[1] NOAA for mean, record high and low and humidity[2]

Source #2: Danish Meteorological Institute for sunshine (1931–1960)[3]

 

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