Promachonas (Greek: Προμαχώνας, Bulgarian: Драготин, Dragotin) is a village and a former community in the Serres regional unit, Macedonia, Greece.

After the liberation of Greece from the Axis and the Greek Civil War, the refugees settled (from the other two settlements) in Promachonas, and thus the village has 245 inhabitants.

Promachonas-Topolnica is an important Late Neolithic settlement and cult site that straddles the Greek-Bulgarian border a few kilometers from the community of Promachonas.

At the top of the monument is placed the symbol of Byzantium, the double-headed eagle, while on the marble column, an inscription has been engraved.

[4] The site of the Battle of the Key where Basil II defeated the Bulgarian army in 1014 is now inside Bulgaria.