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 thus roughly corresponds to the present-day countries of Romania, as well as parts of Moldova, Bulgaria, Serbia, Hungary, Slovakia, and Ukraine.
Dobruja or Dobrudja is a geographical and historical region in the Southeast Europe that has been divided since the 19th century between the territories of Bulgaria and Romania. It is situated between the lower Danube River and the Black Sea, and includes the Danube Delta, Romanian coast, and the northernmost part of the Bulgarian coast. The territory of Dobruja is made up of Northern Dobruja, which is a part of Romania, and Southern Dobruja, which is a part of Bulgaria.
Isaccea is a small town in Tulcea County, in Northern Dobruja, Romania, on the right bank of the Danube, 35 km north-west of Tulcea. According to the 2021 census, it has a population of 4,408.
Trajan's Bridge, also called Bridge of Apollodorus over the Danube, was a Roman segmental arch bridge, the first bridge to be built over the lower Danube and one of the greatest achievements in Roman architecture. Though it was only functional for 165 years, it is often considered to have been the longest arch bridge in both total and span length for more than 1,000 years.
Adamclisi is a commune in Constanța County, in the Dobrogea region of Romania.
Serpent's Wall is an ancient system of earthworks (valla) located in the middle Dnieper Ukraine (Naddniprianshchyna) that stretch across primarily Kyiv Oblast, Ukraine. They seem to be similar in purpose and character to Trajan's Wall situated to the southwest in Bessarabia. The remaining ancient walls have a total length of 1,000 km and constitute less than 20% of the original wall system.
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, and properly means the palisade which ran along the outer edge of the top of the agger, but is usually used to refer to the whole fortification.
The borders of the Roman Empire, which fluctuated throughout the empire's history, were realised as a combination of military roads and linked forts, natural frontiers and man-made fortifications which separated the lands of the empire from the countries beyond.
Roman military borders and fortifications were part of a grand strategy of territorial defense in the Roman Empire, although this is a matter of debate. By the early 2nd century, the Roman Empire had reached the peak of its territorial expansion and rather than constantly expanding their borders as earlier in the Empire and Republic, the Romans solidified their position by fortifying their strategic position with a series of fortifications and established lines of defense. Historian Adrian Goldsworthy argues that the Romans had reached the natural limits which their military traditions afforded them conquest over and that beyond the borders of the early-to-mid Empire lay peoples whose military traditions made them militarily unconquerable, despite many Roman battle victories. In particular, Goldsworthy argues that the cavalry-based warfare of the Parthians, Sarmatians and Persians presented a major challenge to the expansion of Rome's infantry-based armies.
The Moesian Limes is the modern term given to a linked series of Roman forts between the Black Sea shore and Pannonia along the Danube. It was the eastern section of the so-called Danubian Limes and protected the Roman provinces of Upper and Lower Moesia south of the river. The eastern section is often called the limes Scythiae minoris as it was located in the late Roman province of Scythia Minor.
Athanaric's Wall, also called Lower Trajan's Wall or Southern Trajan's Wall, was a fortification line probably erected by Athanaric, between the banks of river Gerasius and the Danube to the land of Taifali. Most probably, Athanaric's Wall has reused the old Roman limes called Limes Transalutanus.
The Upper Trajan's Wall is the modern name given to a fortification located in the central area of modern Moldavia. Some scholars consider it to be of Roman origin, while others think it was built in the third/fourth century by the Germanic Greuthungi to defend their borders against the Huns. It may also have been called Greuthungian Wall in later Roman accounts, but this is uncertain owing to a single polysemic manuscript occurrence in the works of Ammianus Marcellinus.
The Devil's Dykes, also known as the Csörsz árka or the Limes Sarmatiae, are several lines of Roman fortifications built mostly during the reign of Constantine the Great (306–337), stretching between today's Hungary, Romania and Serbia.
Limes Transalutanus is the modern name given to a fortified frontier system of the Roman Empire, built on the western edge of Teleorman's forests in the Roman province of Dacia, modern-day Romania. The frontier was composed of a road following the border linking military forts and towers, a 3 m high vallum 10–12 m wide reinforced with wooden palisades on stone walls and also a ditch. The Transalutanus limes was 235 km long, parallel to Olt river at a distance varying from 5 to 30 km east of the river. The construction was started in 107 under the command of Marcius Turbo, and developed under Iulius Severus (120–126); the final stage of the construction was performed under Septimius Severus (193–211).
Brazda lui Novac is a Roman limes in present-day Romania, known also as Constantine's Wall. It is believed by some historians like Alexandru Madgearu to border Ripa Gothica.
Capidava was an important Geto-Dacian center on the right bank of the Danube. After the Roman conquest, it became a civil and military centre, as part of the province of Moesia Inferior and was part of the defensive frontier system of the Limes Moesiae along the Danube.
The Prut is a 953 km (592 mi) long river in Eastern Europe. It is a left tributary of the Danube. Part of its course forms Romania's border with Moldova and Ukraine.
Noviodunum, known also as Noviodunum ad Istrum, was a fort and a port in the Roman province of Moesia located on the lower Danube.
Roman Dacia was a province of the Roman Empire from 106 to 271–275 AD. Its territory consisted of what are now the regions of Oltenia, Transylvania and Banat. During Roman rule, it was organized as an imperial province on the borders of the empire. It is estimated that the population of Roman Dacia ranged from 650,000 to 1,200,000. It was conquered by Trajan (98–117) after two campaigns that devastated the Dacian Kingdom of Decebalus. However, the Romans did not occupy its entirety; Crișana, Maramureș, and most of Moldavia remained under the Free Dacians.
The Danubian Limes, or Danube Limes, refers to the Roman military frontier or limes which lies along the River Danube in the present-day German state of Bavaria, in Austria, Slovakia, Hungary, Croatia, Serbia, Bulgaria and Romania.
