Vrontous (, - Sharliya) is a mountain range in the northeastern Serres and the westernmost Drama regional units in Greece. Its highest peak is the Ali Babas () at 1,849 m elevation. Other notable peaks are the Kour Lof (1,667 m, southwest of Ali Babas), Mavro vouno (1,653 m, northeast), Siderovouni (1,475 m, east) and Sarligia (1,404 m, southwest). It is a densely forested and sparsely populated mountain range. It stretches between the village Vamvakofyto in the southwest and Perithori in the northeast, over a length of about 35 km. The nearest mountains are the Slavyanka/Orvilos to the north and the Menoikio to the southeast.