High Quality Content by WIKIPEDIA articles! Fiume (in Croatian: Rijeka) is located in the northern tip of the Quarnero in the northern Adriatic. The region of Quarnero (Fiume was still not mentioned) fell within the Holy Roman Empire, with the acquisition of the titles of Margraves of Istria and Dukes of Merania by the Andechs family. The possession was called Merania, from German meer - sea and was thus meaning littoral or Küstenland.