Moesia (/ˈmiːʃə/, /ˈmiːsi.ə/, or /ˈmiːʒə/;Latin: Moesia; Greek: Μοισία) was an ancient region and later Roman province situated in the Balkans, along the south bank of the Danube River. It included most of the territory of modern-day Serbia (without Vojvodina) and the northern parts of the modern Republic of Macedonia (Moesia Superior), as well Northern Bulgaria and Romanian Dobrudja (Moesia Inferior).
In ancient geographical sources, Moesia was bounded to the south by the Haemus (Balkans) and Scardus (Šar) mountains, to the west by the Drinus (Drina) river, on the north by the Donaris (Danube) and on the east by the Euxine (Black Sea).