Tarwin River

Tarwin (Tarwin, Toulerm)
River
Country	Australia
State	Victoria
Regions	South East Coastal Plain (IBRA), South Gippsland
Local government areas	South Gippsland Shire, Baw Baw Shire
Part of	West Gippsland catchment
Tributaries
- left	Wild Dog Creek (Victoria), Berry's Creek (Victoria), Wilkur Creek (Victoria)
- right	Stony Creek (Victoria), Bridge Creek (Victoria)
Primary source	Strzlecki Ranges
Secondary source	Tarwin River East Branch
- location	near the locality of Dollar
- elevation	253 m (830 ft)
Additional source	Tarwin River West Branch
- location	west of Mirboo North
- elevation	91 m (299 ft)
Source confluence	East and West branches of the Tarwin River
- location	west of Meeniyan
- elevation	17 m (56 ft)
- coordinates	37°57′39″S 146°20′2″E / 37.96083°S 146.33389°E / -37.96083; 146.33389
Mouth	Anderson Inlet, Bass Strait
- location	Venus Bay
- elevation	0 m (0 ft)
- coordinates	38°41′3″S 145°50′9″E / 38.68417°S 145.83583°E / -38.68417; 145.83583Coordinates: 38°41′3″S 145°50′9″E / 38.68417°S 145.83583°E / -38.68417; 145.83583
Length	36 km (22 mi)
Area	1,500 km2 (579 sq mi)
Location of the Tarwin River mouth in Victoria

The Tarwin River is a perennial river of the West Gippsland catchment, located in the South Gippsland region of the Australian state of Victoria. The Tarwin River is the primary river system within South Gippsland Shire and has a catchment area of approximately 1,500 square kilometres (580 sq mi), predominantly rural with small pockets of residential land use. It flows south from the Strzlecki Ranges and discharges in the eastern reaches of Anderson Inlet, a shallow estuary connected to Bass Strait.

Formed by the confluence of the Tarwin River East Branch that drains the southwestern slopes of the Strzlecki Ranges from an elevation of 253 metres (830 ft) AHD  and the Tarwin River West Branch that drains the southern slopes of the Strzlecki Ranges from a northerly point at an elevation of 91 metres (299 ft) AHD , the Tarwin River rises near the locale of Tarwin, west of Meeniyan.

The east branch of the river rises below the locale of Dollar, then heads north through Tarwin East and on to Mirboo North before heading south through a valley, breaking out on to cleared farmland north of Dumbalk where the river is up to 12 metres (39 ft) wide with slow flowing water when not in flood; and then continues south. The west branch of the river rises as a number of tributaries on the southern slopes of the Strzelecki Ranges at the south of Mount Worth State Park. The western branch of the river flows through mostly steep, cleared farmlands, fed by six minor tributaries as it flows south, east of Leongatha and towards Meeniyan, generally through flat and rolling farmland.