Tunisia's geography: two Mediterranean coasts and the land behind them

Where the Tunisian coast turns south

Wikipedia's geography article places Tunisia midway between the Atlantic Ocean and the Nile Delta, between latitudes 30° and 38°N and longitudes 7° and 12°E; Britannica gives the latitudes as 30° to 37°N. The country covers 163,610 km², of which 8,250 km² is water. Its east-west extent is limited, the same article notes, and it is the north-south extent that gives a territory of that size its range of environments.

The outline is set by one feature. In northern Tunisia the Mediterranean coast makes an abrupt turn to the south, so the country has two Mediterranean coasts, one running west to east across the top of the country and one running north to south down its eastern side.

The northern coast is the broken one. It is deeply indented, in Britannica's description, and the Mogods range runs along it. Near its eastern end the Medjerda empties into the Gulf of Tunis, and south of the gulf the Cape Bon peninsula carries the last of the Dorsale mountains. Large plains border the eastern coast, Britannica notes: the Sahel south of Sousse and the Jifara south of Gabès. Farther south the shore curves round the Gulf of Gabès, which Wikipedia describes as the western part of the larger Gulf of Sidra, most of whose shore is the main coast of Libya. Djerba, an island in the Gulf of Gabès, entered the World Heritage List in 2023 as "Djerba: Testimony to a settlement pattern in an island territory".

At the scale of the whole sea, the main Wikipedia article on Tunisia says its coastline includes "the African conjunction of the western and eastern parts of the Mediterranean Basin". The country shares maritime borders with Italy, through Sicily and Sardinia to the north, and with Malta to the east. It claims a contiguous zone of 24 nautical miles. Its territorial sea is 12 nautical miles in the text of the geography article and 19 in the summary list at the head of the same page.

How long the shore is depends on where in Wikipedia it is read. The geography article gives 1,148 km, and so does the geography section of the main article, whose introduction gives 1,300 km. Neither figure is dated.

On land Tunisia has two neighbours. Algeria lies to the west along a border of 965 km, and Libya to the south-east along 459 km. Along the Libyan border, Wikipedia notes, the width of the land tapers south-westward into the Sahara, and the southernmost point is the tripoint with both neighbours, in Tataouine Governorate. The westernmost point is the village of Hizwa, due west of Nefta in Tozeur Governorate, and the easternmost is Bel Ahemer on the Libyan border. Wikipedia's list of extreme points puts the northernmost point of the mainland at Ras ben Sakka, also called Ra's al Abyad, in Bizerte Governorate, and calls it the northernmost point of the African continent as well. The main article gives that distinction to Cape Angela. Gallo, in the Galite Islands, lies farther north than either.

How the Dorsale divides the Tell from the steppes

Tunisia's relief is moderate, by Britannica's account. Its spine is the Tunisian Dorsale, or High Tell, a range trending south-west to north-east that continues the Saharan Atlas of Algeria and tapers off towards Cape Bon. Jebel ech Chambi, the highest point in the record at 1,544 m, stands near the centre of the Algerian border. Mount Zaghouan, about 50 km south-west of Tunis, reaches 1,295 m.

North of the Dorsale lies the Tell, low rolling hills and plains that Wikipedia describes as another extension of mountains in Algeria. Its north-western corner is the Kroumirie, a block of sandstone ridges whose height the two sources give differently: about 900 m in Britannica, and 1,050 m in Wikipedia, which adds that snow falls there in winter. Between the Kroumirie and the Mogods to the north and the limestone peaks of the central Dorsale to the south runs the valley of the Medjerda. Britannica describes it as a series of ancient lake basins covered with alluvium, records that it was once the granary of ancient Rome, and calls it today "the richest grain-producing region of Tunisia".

South of the Dorsale the land drops to the steppes, the Haute Steppe in the west and the Basse Steppe in the east. Britannica puts them at about 180 to 460 m and notes secondary ranges crossing them from north to south; Wikipedia bounds them by the Dorsale and a range of hills south of Gafsa. Beyond those hills comes the line of chotts, and beyond the chotts the extreme south, largely sandy desert, much of it part of the Great Eastern Erg of the Sahara.

Soil follows the same order. Britannica finds the most fertile soils in the well-watered valleys between the northern mountains, where sandy clays formed from alluvium, or soils high in lime, cover the valley floors and plains. The plains of the Haute Steppe carry some clay soils of medium fertility. Elsewhere soil tends to be rocky or sandy, and in the dry south it is often saline from heavy evaporation. Among the coarse soils, Britannica singles out the humid coastal plain of the east, between the Gulf of Hammamet and the Gulf of Gabès, where the olive plantations stand, as "the most agriculturally productive of these coarse-textured soil areas".

How much rain reaches each part of Tunisia

All of Tunisia's precipitation falls as rain, according to Britannica, and the amount changes sharply from north to south. Its figure for the Kroumirie is a mean of about 1,520 mm a year. Tozeur, in the south-west, gets less than 100 mm. Wikipedia states the rule behind those two numbers in one line: the differences across Tunisia, as across the rest of the Maghreb, are largely north-south differences, set by rainfall that decreases sharply southward from any point.

Most of the rain comes in the cool half of the year. From mid-autumn to mid-spring, when three-quarters of the annual total falls, Britannica gives northern Tunisia more than 16 inches, about 400 mm, and the steppes 100 to 400 mm. Wikipedia sets thresholds for the rest. Annual rainfall is under 500 mm nearly everywhere in the country, under 250 mm where the climate is pre-Saharan and under 100 mm where it is Saharan, and the southernmost part gets as little as 50 mm around El Borma, on the Algerian border. On that basis Wikipedia calls Tunisia a dry, semi-arid country.

The total is also unreliable. Britannica notes that amounts vary widely from one year to the next, that the irregularity grows towards the desert, and that harvests are poor in dry years. The olive crop shows the swing. In October 2025 Olive Oil Times reported producers forecasting up to 500,000 tonnes of olive oil for the 2025/26 season, about 50% more than the season before, "thanks mainly to well-timed rains". The benchmark it set that against was about 440,000 tonnes in 2019/20, a figure it attributes to the International Olive Council, and it adds that the trees' alternate-bearing cycle swings output from year to year as well.

Averaged over the whole territory, the World Bank's Climate Change Knowledge Portal gives 209.06 mm a year for 1995 to 2014, with precipitation falling by 8.91 mm per decade since 1970 in the ERA5 reanalysis. Its median projection for 2040 to 2059 under the high-emission SSP3-7.0 scenario is 16.48 mm lower, within a range from 44.68 mm less to 3.29 mm more.

What the sea does to Tunisian heat

The north has a Mediterranean climate of mild rainy winters and hot dry summers with no marked season between them, and Britannica traces it southward into semi-arid steppe and then desert. Wikipedia gives the Köppen classes for the two ends of the gradient: hot-summer Mediterranean, Csa, in the north and hot desert, BWh, in the south.

What the eastern coast changes is the range. Britannica compares Sousse on the coast with Kairouan inland. Sousse averages 7 °C in January and 32 °C in August; Kairouan averages 4 °C and 37 °C. The coastal town is warmer in winter and cooler in summer, and Britannica's explanation is the sea.

Farther from the sea the extremes grow. Wikipedia says July and August can pass 40 °C when the tropical continental air of the desert reaches the whole country, and that winters rarely rise above 20 °C, except in the south-west. In the desert south, it adds, daytime temperatures stay around 45 °C through the summer, while the nights can turn cold. Britannica records a reading of about 55 °C at Kebili, a town it places in central Tunisia. The sirocco, a seasonal hot wind from the south, can dry out vegetation badly, according to the same source.

The World Bank portal puts the national mean temperature at 20.4 °C for 1995 to 2014 and measures warming of 0.46 °C per decade since 1970. Its median projection for 2040 to 2059 under SSP3-7.0 adds 1.71 °C, within a range of 1.18 to 2.47 °C.

Where the water runs and where it ends

Britannica counts one river in Tunisia that flows all year, the Medjerda, which it calls the country's only perennially flowing stream. It rises in a further section of the Tell Atlas in Algeria and flows east for 450 km through the north, which Wikipedia describes as the third of the country with reliable rivers. It empties into the Gulf of Tunis and the Lake of Tunis, near the site of ancient Carthage. In antiquity it was the Bagrada, and it is also written Majardah. It has been dammed at Sidi Salem.

The other reliable rivers also rise in the north, Wikipedia notes, apart from a few that come in from north-eastern Algeria. The Oued Zouara rises in Tunisia's own section of the Tell and is held by the Sidi el Barrak Dam, which forms a large lake whose water is used across the north and centre of the country.

Farther south the rivers become wadis. They are intermittent and local, subject to seasonal floods, and they end inland in the chotts. Inside the Sahara even these are rare. In the 1990s the government sponsored a number of dams to control flooding, hold back runoff and recharge the water table.

The shortage has been measured. The World Bank's Tunisia Economic Monitor, released on 22 September 2026, puts renewable fresh water at about 380 m³ per person a year, which the bank describes as well below the international threshold for absolute water scarcity. The report credits better rainfall and reservoir levels in 2025 with short-term relief, and it describes the government's Plan Eau 2050 as envisaging investment of about US$900 million a year through mid-century. The 2026 report gives agriculture 14% of the national workforce and up to half of rural workers, and estimates that without action, water and climate stress could remove at least 30% of agricultural jobs by mid-century.

The BTI 2026 country report dates a severe drought from 2023. It records that SONEDE, the national water supply company, announced night-time supply cuts in March 2023, and that reductions in agricultural water use lasted well into 2024. In World Bank data for 2022, cited in the same report, 97.2% of the population had access to a basic water source.

What lies on the floor of the chotts

South of the steppes a line of salt lakes, called chotts or shatts, runs east to west along the northern edge of the Sahara, from the Gulf of Gabès into Algeria. Britannica treats them as one depression. Chott el Jerid, Chott el Fedjaj and Chott el Rharsa in Tunisia, with Chott Melrhir and Chott Merouane in Algeria, lie in a trough that was formerly an arm of the sea and extends nearly 400 km west from the Gulf of Gabès.

Chott el Jerid alone occupies a salt-flat basin of about 4,900 km², and water covers it only in the lowest areas except after heavy rain. In Britannica's figures the floor of the depression reaches 16 m below sea level in Jerid and 21 m in Rharsa. The sources do not agree on which chott is the lowest point or on its depth. The record gives the lowest point as Shatt al Gharsah, its spelling of Rharsa, at Britannica's 21 m below sea level, and Wikipedia names Chott el Djerid at 17 m. The record's figure is the one printed beside this article.

Britannica records the flats as "an important source of phosphates since the discovery of the mineral there in 1949", and a road now runs across them, used by visitors to the desert oases and the towns of the hinterland. Tozeur and Nefta, the main oasis towns on the edge of Chott el Jerid, are known for their date palms, and the country's westernmost point, the village of Hizwa, lies due west of Nefta on the Algerian border. Most of the phosphate rock is mined farther north, in the Gafsa Basin, which the Natural Resource Governance Institute credits with more than 90% of Tunisia's production.

UNESCO lists Chott El Jerid on Tunisia's tentative list for World Heritage, entered in 2008, the same year as the oasis of Gabès.

Which plants and animals the land still carries

Plant and animal life follow the same erratic climate from north to south, in Britannica's account. The cork oak forest of the Kroumirie, with a fern undergrowth that shelters wild boar, gives way to scrub and to steppe under esparto grass with small game, and then to desert, where hunting is forbidden to protect the gazelles that remain. The forest is also the timber supply. The lumber trade is essentially confined to oak and cork from the Kroumirie, and esparto from the plains is made into quality paper.

Scorpions occur in every region, and the dangerous snakes include the horned viper and the cobra. Desert locusts sometimes damage crops in the south. Wikipedia counts five terrestrial ecoregions: Mediterranean conifer and mixed forests, Saharan halophytics, Mediterranean dry woodlands and steppe, Mediterranean woodlands and forests, and North Saharan steppe and woodlands.

Some of the fauna has gone. Wikipedia records that the Barbary macaque lived in Tunisia until historic times and that the monk seal is now locally extinct. Tree cover is measured from satellite imagery: Global Forest Watch, as cited by Wikipedia, gives 223,929 ha of tree cover at a density above 30% in 2000 and a cumulative loss of 38,152 ha from 2001 to 2024, about 17.0% of the 2000 area, with regrowth left out of the count. Wikipedia lists deforestation, overgrazing, soil erosion and desertification among Tunisia's current environmental issues.

One natural site in Tunisia is on the World Heritage List. Ichkeul National Park, in the far north of the country, was inscribed in 1980. UNESCO describes its lake and wetland as a stopover for hundreds of thousands of migrating birds, among them ducks, geese, storks and pink flamingos, and calls Ichkeul "the last remaining lake in a chain that once extended across North Africa". The greylag goose, the coot and the wigeon are among the birds that winter there, according to Britannica. The tentative list adds two national parks, El Feija and Bouhedma, both entered in 2008, and two geological sites entered in 2016: the marine Permian of Jebel Tebaga and the stratotype of the Cretaceous-Tertiary boundary.

Where Tunisians settled and where they moved

Britannica divides Tunisia into four natural and demographic regions: a relatively fertile, well-watered north; a semi-arid centre; the Sahel on the east-central coast, which it calls preeminently olive-growing country; and a desert south where, outside the oases, all vegetation disappears. In the centre and south some people still follow a semi-nomadic way of life. In the north and east, and especially along the coasts, Britannica finds a denser and more mixed population, more crowded villages and larger cities.

Earlier migrations settled the same ground. Muslim refugees from Sicily settled in the Sahel after the Normans captured the island in 1091. Spanish Muslims began to arrive after the fall of Seville in 1248, the movement became an exodus in the early 17th century, and some 200,000 of them settled around Tunis, in the Medjerda valley and on Cape Bon, bringing in Britannica's account more advanced agricultural and irrigation techniques.

By the early 21st century cities held about two-thirds of the population, according to Britannica, and the agglomeration of Tunis alone about one-fifth. The capital is built on a hill slope running down to the Lake of Tunis, on a narrow strip of land between that lake and Séjoumi, and its hills rise just above 50 m.

The census of 6 November 2024 counted 11,972,169 people. The national statistics institute, the INS, reports that 59.1% of them lived in two of its five districts: District 2, which groups the governorates of Tunis, Ariana, Ben Arous, Manouba, Nabeul and Zaghouan, and District 3, which groups Sousse, Monastir, Mahdia, Kairouan, Kasserine and Siliana. Tunis governorate held 3,734 people per km² in 2024. The INS describes internal migration drawing working-age people to Tunis and Sousse at the expense of the interior governorates, and the four censuses since 1994 show it in the counts.

Between the censuses of 1994 and 2024 Ariana, in District 2 with the capital, more than doubled and Ben Arous nearly did, while Le Kef and Siliana lost people and Jendouba ended within a few hundred of where it began. The BTI 2026 report describes the socioeconomic indicators of the southern regions as standing in stark contrast to those of Tunis and the northern coastal areas, and Britannica describes the same imbalance between the north and the Sahel on one side and the arid centre and south on the other. Tunisia: economy follows that imbalance through what each region produces.