Topolog
Location
Country	Romania
Counties	Argeș, Vâlcea
Physical characteristics
Source	Făgăraș Mountains
• location	confluence of headwaters Negoiu and Scara
• elevation	1,340 m (4,400 ft)
Mouth	Olt
• location	Ostroveni
• coordinates	44°56′33″N 24°15′53″E / 44.9424°N 24.2647°E / 44.9424; 24.2647
• elevation	184 m (604 ft)
Length	111.5 km (69.3 mi)
Basin size	546.3 km2 (210.9 sq mi)
Basin features
Progression	Olt→ Danube→ Black Sea

The Topolog is a left tributary of the river Olt in Romania.^[1][2][3] It discharges into the Olt (Băbeni Reservoir) in Ostroveni.^[4] It is formed by two source rivers that come from the southern slopes of the Făgăraș Mountains: Negoiu and Scara. It flows through the communes Sălătrucu, Șuici, Cepari, Tigveni, Ciofrângeni, Poienarii de Argeș, Milcoiu, Nicolae Bălcescu and Galicea. Including its longest source river, Negoiu, its total length is 111.5 km (69.3 mi) and its basin size is 546.3 km² (210.9 sq mi).^[2][5] For much of its length it forms the border between the counties Argeș and Vâlcea.

The following rivers are tributaries to the river Topolog (from source to mouth):^[2]

• Left: Negoiu, Izvorul Podeanului, Marginea, Cumpăna, Valea Plopilor, Valea Satului
• Right: Scara, Mâzgavu, Izvorul Coastelor, Topologel, Cărpeniș, Bădislava, Ciutești, Șerbăneasa