Same entry in ps.-Zonaras (delta p.568). It is repeated as sigma 94: Saos.
That these two rivers ran through a region of the Balkans, north-east of Illyria, known to the Greeks as the second Paeonia is confirmed elsewhere: Appian, Illyrica 65-66; Arrian, Indica 4.16; Zosimus, Historia nova 2.18.5 (on Sirmion, a city of Paeonia). The region most commonly known as Paeonia runs from the Thracian Chersonnese (modern Gallipoli Peninsula) into what was later Macedonia. The area between the Drava and Sava was the Roman province of Savia or Pannonia II (OCD(4) p.1075, present-day Slavonia, a part of Croatia). It is also an area once occupied by the Avars.
The Drava (Drau) rises in the Western Tyrol of Austria, runs through Klagenfurt, enters Slovenia, forms part of the frontier between Hungary and Slavonia, and then runs through Novi Sad to join the Danube in Vojvodina. The Roman province of Pannonia I lay between the Drava and the Danube, somewhat akin to Western Hungary.
The Sava, to its south, rises in Slovenia, runs by Ljubljana, separates Slavonia from Bosnia-Herzogovina and joins the Danube at Belgrade.