The

border Borders are usually defined as geographical boundaries, imposed either by features such as oceans and terrain, or by political entities such as governments, sovereign states, federated states, and other subnational entities. Political borders c ...

s of the

Roman Empire The Roman Empire ( la, Imperium Romanum ; grc-gre, Βασιλεία τῶν Ῥωμαίων, Basileía tôn Rhōmaíōn) was the post- Republican period of ancient Rome. As a polity, it included large territorial holdings around the Mediter ...

, which fluctuated throughout the empire's history, were realised as a combination of military roads and linked forts, natural frontiers (most notably the

Rhine ), Surselva, Graubünden, Switzerland , source1_coordinates= , source1_elevation = , source2 = Rein Posteriur/Hinterrhein , source2_location = Paradies Glacier, Graubünden, Switzerland , source2_coordinates= , so ...

and

Danube The Danube ( ; ) is a river that was once a long-standing frontier of the Roman Empire and today connects 10 European countries, running through their territories or being a border. Originating in Germany, the Danube flows southeast for , p ...

river A river is a natural flowing watercourse, usually freshwater, flowing towards an ocean, sea, lake or another river. In some cases, a river flows into the ground and becomes dry at the end of its course without reaching another body of w ...

s) and man-made

fortification A fortification is a military construction or building designed for the defense of territories in warfare, and is also used to establish rule in a region during peacetime. The term is derived from Latin ''fortis'' ("strong") and ''facere' ...

s which separated the lands of the empire from the countries beyond.

The ''limes''

The word ''limes'' is sometimes used by modern scholars to denote the frontier of the Roman Empire but was not used by the Romans as such. After the third century it was an administrative term, indicating a military district, commanded by a . The Latin noun had a number of different meanings: a path or balk marking off the boundaries of fields; a boundary line or marker; any road or path; any channel, such as a stream channel; or any distinction or difference between two things. In Britannia the Empire built two walls one behind the other; for Mauretania there was a single wall with forts on both sides of it. In other places, such as Syria and

Arabia Petraea Arabia Petraea or Petrea, also known as Rome's Arabian Province ( la, Provincia Arabia; ar, العربية البترائية; grc, Ἐπαρχία Πετραίας Ἀραβίας) or simply Arabia, was a frontier province of the Roman Emp ...

, there was no continuous wall; instead there was a net of border settlements and forts occupied by the Roman army. In

Dacia Dacia (, ; ) was the land inhabited by the Dacians, its core in Transylvania, stretching to the Danube in the south, the Black Sea in the east, and the Tisza in the west. The Carpathian Mountains were located in the middle of Dacia. It ...

, the limes between the Black Sea and the Danube were a mix of the latter and the wall defenses: the was the conjunction of two, and sometimes three, lines of ''

vallum Vallum is either the whole or a portion of the fortifications of a Roman camp. The vallum usually comprised an earthen or turf rampart (Agger) with a wooden palisade on top, with a deep outer ditch (fossa). The name is derived from '' vallus'' (a ...

'', with a Great Camp and many minor camps spread through the fortifications.

The northern borders

In continental Europe, the borders were generally well defined, usually following the courses of major rivers such as the

and the

. Nevertheless, those were not always the final border lines; the province of

, modern

Romania Romania ( ; ro, România ) is a country located at the crossroads of Central, Eastern, and Southeastern Europe. It borders Bulgaria to the south, Ukraine to the north, Hungary to the west, Serbia to the southwest, Moldova to the east, and ...

, was completely on the far side of the Danube, and the province of Germania Magna, which must not be confused with

Germania Inferior Germania Inferior ("Lower Germania") was a Roman province from AD 85 until the province was renamed Germania Secunda in the fourth century, on the west bank of the Rhine bordering the North Sea. The capital of the province was Colonia Agripp ...

and Germania Superior, was the land between the Rhine, the Danube and the

Elbe The Elbe (; cs, Labe ; nds, Ilv or ''Elv''; Upper and dsb, Łobjo) is one of the major rivers of Central Europe. It rises in the Giant Mountains of the northern Czech Republic before traversing much of Bohemia (western half of the Czech Re ...

(Although this province was lost three years after its creation as a result of the

Battle of Teutoburg Forest The Battle of the Teutoburg Forest, described as the Varian Disaster () by Roman historians, took place at modern Kalkriese in AD 9, when an alliance of Germanic peoples ambushed Roman legions and their auxiliaries, led by Publius Quinctilius V ...

). In Great Britain both Hadrian and

Antoninus Pius Antoninus Pius ( Latin: ''Titus Aelius Hadrianus Antoninus Pius''; 19 September 86 – 7 March 161) was Roman emperor from 138 to 161. He was the fourth of the Five Good Emperors from the Nerva–Antonine dynasty. Born into a senatori ...

built defences to protect the province of

Britannia Britannia () is the national personification of Britain as a helmeted female warrior holding a trident and shield. An image first used in classical antiquity, the Latin ''Britannia'' was the name variously applied to the British Isles, Great ...

from the Caledonians. Hadrian's Wall, constructed in 122 held a garrison of 10,000 soldiers, while the Antonine Wall, constructed between 142 and 144, was abandoned by 164 and briefly reoccupied in 208, under the reign of

Septimius Severus Lucius Septimius Severus (; 11 April 145 – 4 February 211) was Roman emperor from 193 to 211. He was born in Leptis Magna (present-day Al-Khums, Libya) in the Roman province of Africa. As a young man he advanced through the customary suc ...

The Pannonian Limes

The eastern borders

The eastern borders changed many times, as the Roman Empire was facing two major powers, The

Parthian Empire The Parthian Empire (), also known as the Arsacid Empire (), was a major Iranian political and cultural power in ancient Iran from 247 BC to 224 AD. Its latter name comes from its founder, Arsaces I, who led the Parni tribe in conque ...

and the Sasanian Empire. The Parthians were a group of

Iranian peoples The Iranian peoples or Iranic peoples are a diverse grouping of Indo-European peoples who are identified by their usage of the Iranian languages and other cultural similarities. The Proto-Iranians are believed to have emerged as a separat ...

ruling most of Greater Iran that is in modern-day Iran, western Iraq, Armenia and the Caucasus. The Sasanians succeeded the Parthians in 224–226 and were recognised as one of the leading world powers alongside its neighbouring arch-rival the Roman (Byzantine) Empire for a period of more than 400 years.

The southern borders

At the greatest extent of the

Empire An empire is a "political unit" made up of several territories and peoples, "usually created by conquest, and divided between a dominant center and subordinate peripheries". The center of the empire (sometimes referred to as the metropole) ex ...

, the southern border lay along the deserts of

Arabia The Arabian Peninsula, (; ar, شِبْهُ الْجَزِيرَةِ الْعَرَبِيَّة, , "Arabian Peninsula" or , , "Island of the Arabs") or Arabia, is a peninsula of Western Asia, situated northeast of Africa on the Arabian Plat ...

in the Middle East and the Sahara in

North Africa North Africa, or Northern Africa is a region encompassing the northern portion of the African continent. There is no singularly accepted scope for the region, and it is sometimes defined as stretching from the Atlantic shores of Mauritania in ...

, which represented a natural barrier against expansion. The Empire controlled the

Mediterranean The Mediterranean Sea is a sea connected to the Atlantic Ocean, surrounded by the Mediterranean Basin and almost completely enclosed by land: on the north by Western Europe, Western and Southern Europe and Anatolia, on the south by North Africa ...

shores and the mountain ranges further inland. The Romans attempted twice to occupy the Siwa Oasis and finally used Siwa as a place of banishment. However, the Romans controlled the

Nile The Nile, , Bohairic , lg, Kiira , Nobiin: Áman Dawū is a major north-flowing river in northeastern Africa. It flows into the Mediterranean Sea. The Nile is the longest river in Africa and has historically been considered the longest ...

many kilometres into Africa up to Syena, Berenice, Hyerasykaminos and even Qasr Ibrim, (the southernmost of all), near the modern border between

Egypt Egypt ( ar, مصر , ), officially the Arab Republic of Egypt, is a transcontinental country spanning the northeast corner of Africa and southwest corner of Asia via a land bridge formed by the Sinai Peninsula. It is bordered by the Medit ...

and Sudan, then Meroe, lying very near the tropic. The period in which each aforementioned town represented the final frontier of Rome is uncertain. In Africa the Romans controlled the area north of the Sahara, from the

Atlantic Ocean The Atlantic Ocean is the second-largest of the world's five oceans, with an area of about . It covers approximately 20% of Earth's surface and about 29% of its water surface area. It is known to separate the " Old World" of Africa, Europe ...

to Egypt, with the borders being controlled by many sections of fortifications such as the Limes Arabicus (called the Limes Uranus), Limes Mauretaniae,

Fossatum Africae ''Fossatum Africae'' ("African ditch") is one or more linear defensive structures (sometimes called ''limes'') claimed to extend over or more in northern Africa constructed during the Roman Empire to defend and control the southern borders of th ...

, Fossa regia,

Limes Tripolitanus The ''Limes Tripolitanus'' was a frontier zone of defence of the Roman Empire, built in the south of what is now Tunisia and the northwest of Libya. It was primarily intended as a protection for the tripolitanian cities of Leptis Magna, Sabratha ...

, Limes Numidiae, etc. In the south of Mauritania Tingitana Romans made a limes in the third century, just north of the area of actual Casablanca near Sala and stretching to

Volubilis Volubilis (; ar, وليلي, walīlī; ber, ⵡⵍⵉⵍⵉ, wlili) is a partly excavated Berber-Roman city in Morocco situated near the city of Meknes, and may have been the capital of the kingdom of Mauretania, at least from the time of Kin ...

expanded the "Limes Tripolitanus" dramatically, even briefly holding a military presence in the Garamantian capital Garama in AD 203. Much of the initial campaigning success was achieved by

Quintus Anicius Faustus Quintus Anicius Faustus (fl. late 2nd century – early 3rd century AD) was a Roman military officer and senator who was appointed suffect consul in AD 198. Biography Born either in Uzappa in the province of Numidia, or in Praeneste in Ita ...

, the legate of Legio III Augusta. Following his African conquests, the Roman Empire may have reached its greatest extent during the reign of

, David L. Kennedy, Derrick Riley (2012)
''Rome's Desert Frontiers'', page 13

Routledge Routledge () is a British multinational publisher. It was founded in 1836 by George Routledge, and specialises in providing academic books, journals and online resources in the fields of the humanities, behavioural science, education, law ...

R.J. van der Spek Robartus Johannes (Bert) van der Spek (born 18 September 1949 in Zoetermeer) is a Dutch ancient historian, specializing in the Seleucid Empire. He was a full professor in Ancient Studies at VU University Amsterdam from 1993 to his retirement in 2014 ...

, Lukas De Blois (2008)
''An Introduction to the Ancient World'', page 272

under whom the empire encompassed an area of . Tabula Peutingeriana - Miller

References

Bibliography

* * * *

External links

{{Territories with limited Roman Empire occupation & presence Ancient Roman geography