Historical source which reappeared in the 9th century mention Serbs as a people "which is said to be holding the large part of Dalmatia", but Dalmatia in the Roman sense, as a region between the Adriatic on the south, the Sava on the north and the Drina (or Ibar) on the east, but according to John (Jr.) Fine, the presence of Serbs in this area is disputable since the Byzantine sources were limited to the southern coast, but it is possible that among other tribes existed a tribe or group of small tribes of Serbs. According to Živković, the usage of the term Dalmatia in the "Royal Frankish Annals" to refer both to the land where Serbs ruled as well as to the lands under the rule of Croat duke, was likely a reflection of the Franks' territorial aspirations towards the entire area of the former Roman Province of Dalmatia. In the contemporary "Vita Hludovici" that description of the Serbs is omitted. Though the described borders mark a large area, it is mostly a mountainous and inaccessible terrain, rugged with the high ranges of the Dinarides. Within this region, the Serbs settled only a small, isolated and mutually distant river valleys, karst fields and fertile basins. Those patches of the territory had fertile land, suitable for the agriculture, while the barely accessible, some mountain regions remained uninhabited.