According to Müllenhoff (1856), Schütte (1917), Urbannczyk (2001) and Matei-Popescu (2007), Agrippa's commentaries mention the river Vistula as the western boundary of Dacia. Urbannczyk (1997) speculates that according to Agrippa’s commentaries, and the map of Agrippa (before 12 BC), the Vistula river separated Germania and Dacia. This map is lost and its contents are unknown However, later Roman geographers, including Ptolemy (AD 90 – c. AD 168) (II.10, III.7) and Tacitus (AD 56 – AD 117) (ref: Germania XLVI) considered the Vistula as the boundary between Germania and Sarmatia Europaea, or Germania and Scythia.