| Naas | |
| Name Etymology: | Possibly named after Naas, Ireland[1] |
| Pushpin Map: | Australia Australian Capital Territory |
| Pushpin Map Caption: | Location of the Naas River mouth in the ACT |
| Subdivision Type1: | Country |
| Subdivision Name1: | Australia |
| Subdivision Type2: | Territory |
| Subdivision Name2: | Australian Capital Territory |
| Subdivision Type3: | Region |
| Subdivision Name3: | South Eastern Highlands (IBRA), Capital Country |
| Length: | 26km (16miles) |
| Source1: | Snowy Mountains |
| Source1 Location: | Namadgi National Park |
| Source1 Coordinates: | -35.8392°N 149.0836°W |
| Source1 Elevation: | 898m (2,946feet) |
| Mouth: | confluence with the Gudgenby River |
| Mouth Location: | south of Tharwa |
| Mouth Coordinates: | -35.6003°N 149.0678°W |
| Mouth Elevation: | 631m (2,070feet) |
| River System: | Murrumbidgee River, Murray–Darling basin |
| Tributaries Left: | Nass Creek, Left Hand Creek (ACT), Gudgenby Creek, Reedy Creek (ACT) |
| Custom Label: | National park |
| Custom Data: | Namadgi |
| Extra: | [2] |
The Naas River, a perennial stream of the Murrumbidgee catchment within the Murray–Darling basin, is located in the Australian Capital Territory, Australia.
The river rises in the southern ranges of Namadgi National Park, south of Canberra, with flow generated by runoff and melting snow during spring from the Snowy Mountains. The river flows generally north, joined by four minor tributaries, before reaching its confluence with the Gudgenby River, south of Tharwa; descending over its 26km (16miles) course.[2]
The watershed boundary of the Naas River defines the southern and south-eastern border of the Australian Capital Territory with New South Wales.[3]