The name: Pannonia from Illyrian, from the Proto-Indo-European root *pen-, "swamp, water, wet" (cf. English fen, "marsh"; Hindi pani, "water")
Pannonia was an ancient province of the Roman Empire bounded north and east by the Danube, coterminous westward with Noricum and upper Italy, and southward with Dalmatia and upper Moesia. Pannonia was located over the territory of the present-day western Hungary, eastern Austria, northern Croatia, north-western Serbia, northern Slovenia, western Slovakia and northern Bosnia and Herzegovina.
Pannonia Prima in the northwest, with its capital in Savaria / Sabaria Pannonia Valeria in the northeast, with its capital in Sopianae Pannonia Savia in the southwest, with its capital in Siscia Pannonia Secunda in the southeast, with its capital in Sirmium