stretching as it does along the Ister [Danube] on its southern side and on the opposite side along the mountain-side of the Hercynian [Black] Forest (for the land of the Getae also embraces a part of the mountains), afterwards broadens out towards the north as far as the Tyregetae; but I cannot tell the precise boundaries″ On this basis, Lengyel and Radan (1980), Hoddinott (1981) and Mountain (1998) consider that the Geto-Dacians inhabited both sides of the Tisza river prior to the rise of the Celtic Boii, and again after the latter were defeated by the Dacians. The hold of the Dacians between the Danube and Tisza was tenuous. However, the archaeologist Parducz argued a Dacian presence west of the Tisa dating from the time of Burebista. According to Tacitus (AD 56–117) Dacians bordered Germania in the south-east, while Sarmatians bordered it in the east. In the 1st century AD, the Iazyges settled West of Dacia, on the plain between the Danube and the Tisa rivers, according to the scholars' interpretation of Pliny's text: "The higher parts between the Danube and the Hercynian Forest (Black Forest) as far as the winter quarters of Pannonia at Carnutum and the plains and level country of the German frontiers there are occupied by the Sarmatian Iazyges, while the Dacians whom they have driven out hold the mountains and forests as far as the river Theiss". 2nd century AD Written a few decades after Emperor Trajan's Roman conquest of parts of Dacia in AD 105–106, Ptolemy's Geographia included the boundaries of Dacia. According to the scholars' interpretation of Ptolemy (Hrushevskyi 1997, Bunbury 1879, Mocsy 1974, Bărbulescu 2005) Dacia was the region between the rivers Tisza, Danube, upper Dniester, and Siret. Mainstream historians accept this interpretation: Avery (1972) Berenger (1994) Fol (1996) Mountain (1998), Waldman Mason (2006). Ptolemy also provided a couple of Dacian toponyms in south Poland in the Upper Vistula (Polish: Wisla) river basin: Susudava and Setidava (with a manuscript variant Getidava). This could have been an "echo" of Burebista's expansion. It seems that this northern expansion of the Dacian language, as far as the Vistula river, lasted until AD 170–180 when the migration of the Vandal Hasdingi pushed out this northern Dacian group. This Dacian group, possibly the Costoboci/Lipița culture, is associated by Gudmund Schütte with towns having the specific Dacian language ending "dava" i.e. Setidava. The Roman province Dacia Traiana, established