Vamvakofyto (Greek: Βαμβακόφυτο, Bulgarian: Савяк) is a village in the municipal unit Sidirokastro, in the northern part of Serres regional unit, Greece.
Its altitude is 120 meters.
Coordinates: 41°10′44″N 23°23′38″E / 41.179°N 23.394°E / 41.179; 23.394