Northern Bulgaria in the context of "Moesia Inferior"

Varna (Bulgarian: Варна, pronounced [ˈvarnɐ]) is the third-largest city in Bulgaria and the largest city and seaside resort on the Bulgarian Black Sea Coast and in the Northern Bulgaria region. Situated strategically in the Gulf of Varna, the city has been a major economic, social, and cultural centre for almost three millennia. Historically known as Odessos (Ancient Greek: Ὀδησσός), Varna developed from a Thracian seaside settlement into a major seaport on the Black Sea.

Varna is a significant hub for business, transportation, education, tourism, entertainment, and healthcare. The city is referred to as the maritime capital of Bulgaria and is home to the headquarters of the Bulgarian Navy and merchant marine. In 2008, Varna was designated as the seat of the Black Sea Euroregion by the Council of Europe. In 2014, Varna was awarded the title of European Youth Capital 2017.

The East European Plain (also called the Russian Plain, or historically the Sarmatic Plain) is a vast interior plain extending east of the North European Plain, and comprising several plateaus stretching roughly from 25 degrees longitude eastward. It includes Volhynian-Podolian Upland on its westernmost fringe, the Central Russian Upland, and, on the eastern border, encompasses the Volga Upland. The plain includes also a series of major river basins such as the Dnieper Lowland, the Oka–Don Lowland, and the Volga Basin. At the southeastern point of the East European Plain are the Caucasus and Crimean mountain ranges. Together with the North European Plain (covering much of Belgium, the Netherlands, Denmark, Germany and Poland), and covering the Baltic states (Estonia, Latvia and Lithuania), European Russia, Belarus, Ukraine, Moldova, southeastern Romania, and, at its southernmost point, the Danubian Plain in Northern Bulgaria (including Ludogorie and Southern Dobruja), it constitutes the majority of the Great European Plain (European Plain), the greatest mountain-free part of the European landscape. The plain spans approximately 4,000,000 km (2,000,000 sq mi) and averages about 170 m (560 ft) in elevation. The highest point of the plain (480 metres (1,574.8 ft)) is in the Bugulma-Belebey Upland, in the Eastern part of the plain, in the elevated area by the Ural Mountains (priyralie).

Thrace (/θreɪs/, thrayss; Bulgarian: Тракия, romanised: Trakiya; Greek: Θράκη, romanised: Thráki; Turkish: Trakya) is a geographical and historical region in Southeast Europe roughly corresponding to the province of Thrace in the Roman Empire. Bounded by the Balkan Mountains to the north, the Aegean Sea to the south, and the Black Sea to the east, it comprises present-day southeastern Bulgaria (Northern Thrace), northeastern Greece (Western Thrace), and the European part of Turkey (East Thrace). Lands also inhabited by ancient Thracians extended in the north to modern-day Northern Bulgaria and Romania and to the west into Macedonia.

Moesia (/ˈmiːʃə, -siə, -ʒə/; Latin: Moesia; Greek: Μοισία, romanized: Moisía) was a Roman province situated in the Balkans south of the Danube River. Created after the Danubian-Balkan conquest during the reign of Augustus, Moesia included most of the territory of modern eastern Serbia, Kosovo, north-eastern Albania, northern parts of North Macedonia (Moesia Superior), Northern Bulgaria, Romanian Dobruja and small parts of Southern Ukraine (Moesia Inferior).

Albanians (Bulgarian: албанци, albantsi) are a minority ethnic group in Bulgaria (Albanian: Bullgaria). Although according to the 2011 census they only numbered 220, their number in the Bulgarian lands was much larger in the past. Between the 15th and 17th century, groups of Albanians (both Roman Catholic and Eastern Orthodox by confession) settled in many parts of modern northern Bulgaria, with a less numerous group of settlers in southern Thrace. Eventually, they were fully assimilated into the surrounding Bulgarian communities.

The Dacians (/ˈdeɪʃənz/; Latin: Daci [ˈdaːkiː]; Ancient Greek: Δάκοι, Δάοι, Δάκαι) were the ancient Indo-European inhabitants of the cultural region of Dacia, located in the area near the Carpathian Mountains and west of the Black Sea. They are often considered a subgroup of the Thracians. This area includes mainly the present-day countries of Romania and Moldova, as well as parts of Ukraine, Eastern Serbia, Northern Bulgaria, Slovakia, Hungary and Southern Poland. The Dacians and the related Getae spoke the Dacian language, which has a debated relationship with the neighbouring Thracian language and may be a subgroup of it. Dacians were somewhat culturally influenced by the neighbouring Scythians and by the Celtic invaders of the 4th century BC.