| Weir | |
| Pushpin Map: | Australia Queensland |
| Pushpin Map Caption: | Location of Weir River mouth on the Queensland-New South Wales border |
| Subdivision Type1: | Country |
| Subdivision Name1: | Australia |
| Subdivision Type2: | State |
| Subdivision Name2: | Queensland |
| Subdivision Type3: | Region |
| Subdivision Name3: | Darling Downs |
| Length: | 470km (290miles) |
| Source1: | Great Dividing Range |
| Source1 Location: | southwest of |
| Source1 Coordinates: | -27.6072°N 151.0194°W |
| Source1 Elevation: | 358m (1,175feet) |
| Mouth: | Barwon River |
| Mouth Location: | northeast of |
| Mouth Coordinates: | -28.8325°N 149.1011°W |
| Mouth Elevation: | 166m (545feet) |
| River System: | Barwon River catchment, Murray–Darling basin |
| Custom Label: | Waterhole |
| Custom Data: | Wanda Wanda Waterhole |
| Extra: | [1] |
The Weir River, a river that is part of the Border Rivers group and also forms part of the Barwon River catchment in the Murray–Darling basin, is located in the Darling Downs region of Queensland, Australia.
The headwaters of the river rise on the western slopes of the Great Dividing Range[2] in the Dunmore State forest and flows in a south westerly direction. The river continues through the Booroondoo State Forest then crosses the Leichhardt Highway, flows past Currajong and Goodar and then veers west. It continues running almost parallel with the Barwon Highway near Bungunya then later veers south west, again crossing the highway just east of Talwood. It flows through the Wanda Wanda Waterhole then continues south west until discharging into the Barwon River northeast of Mungindi on the border between Queensland and New South Wales. The river descends over its 470km (290miles) course.[1]
The Weir, Macintyre, Dumaresq and the Queensland branch of the Severn and the New South Wales branch of the Severn rivers are known as the Border Rivers that straddle the Queensland and New South Wales border and feed into the Murray-Darling Basin. The rivers have a combined catchment area of 44600km2.[2]