Constantine Dragaš, Serbian Prince of Velebusdos; Serres, Greece; and the Struma River valley in western Bulgaria
The Dragovištica (Serbian Cyrillic: Драговиштица) or Dragovishtitsa (Bulgarian Cyrillic: Драговищица) - a river in southeastern Serbia and western Bulgaria, and a tributary of the Struma river
Around that time, when it became clear that the Allies were pulling troops from the eastern flank and were concentrating them against Monastir the commander of the Bulgarian Second Army general Todorov ordered the 7th Rila Division to take positions for an attack over the Struma river, in order to assist the hard pressed Bulgarians and Germans west of the Vardar.
Strez was for a time a Duke under Stefan Nemanjić and had by 1209 conquered most of Macedonia; from the Struma valley in the east, which bordered lands controlled by Boril, to Bitola and perhaps Ohrid in the west, and from Skopje in the north to Veria in the south.
Sitalces enlarged his kingdom by successful wars, and it soon comprised the whole territory from Abdera in the south to the mouths of the Danube in the north, and from the Black Sea in the east to the sources of the Struma in the west.
Initially it was believed a stray mine had sunk Struma, but in the 1960s the German historian Jürgen Rohwer established that SC-213 had done so.