Isaac River
| Isaac | |
| River | |
| Name origin: Frederick Nevil Isaac | |
| Country | Australia |
|---|---|
| State | Queensland |
| Region | Central Queensland |
| Part of | Fitzroy River |
| Tributaries | |
| - left | Connors River |
| Source | Great Dividing Range |
| - location | below Moranbah North |
| - elevation | 245 m (804 ft) |
| - coordinates | 21°27′03″S 148°11′40″E / 21.45083°S 148.19444°E |
| Mouth | confluence with the MacKenzie River |
| - elevation | 85 m (279 ft) |
| - coordinates | 22°52′19″S 149°20′01″E / 22.87194°S 149.33361°ECoordinates: 22°52′19″S 149°20′01″E / 22.87194°S 149.33361°E |
| Length | 457 km (284 mi) |
| Basin | 22,364 km2 (8,635 sq mi) |
 Location of Isaac River mouth in Queensland
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The Isaac River is a river and anabranch located in Central Queensland, Australia.
The headwaters of the river rise near the Moranbah North coal mine in the Great Dividing Range and flow in a south easterly crossing the Peak Downs Highway near Moranbah. It continues past Iffley and veers eastward at Leichhardt Downs forming a series of braided channels and veers south east again and flowing past the eastern edge of Junee State Forest and then discharges into the MacKenzie River of which it is a tributary.
The river has a catchment area of 22,364 square kilometres (8,635 sq mi) of which an area of 474 square kilometres (183 sq mi) is composed of riverine wetlands.
The river was named for the pastoralist Frederick Nevil Isaac by the explorer Ludwig Leichhardt who came across the river during his 1845 expedition through the area to Port Essington. Isaac owned Gowrie Station in the Darling Downs and was a keen supporter of Leichhardts.
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