Naas
Location of the Naas River mouth in the ACT
Etymology	Possibly named after Naas, Ireland[1]
Location
Country	Australia
Territory	Australian Capital Territory
Region	South Eastern Highlands (IBRA), Capital Country
Physical characteristics
Source	Snowy Mountains
• location	Namadgi National Park
• coordinates	35°50′21″S 149°5′1″E / 35.83917°S 149.08361°E / -35.83917; 149.08361
• elevation	898 m (2,946 ft)
Mouth	confluence with the Gudgenby River
• location	south of Tharwa
• coordinates	35°36′1″S 149°4′4″E / 35.60028°S 149.06778°E / -35.60028; 149.06778
• elevation	631 m (2,070 ft)
Length	26 km (16 mi)
Basin features
River system	Murrumbidgee River, Murray–Darling basin
Tributaries
• left	Nass Creek, Left Hand Creek (ACT), Gudgenby Creek, Reedy Creek (ACT)
National park	Namadgi
[2]

The Naas River, a perennial stream of the Murrumbidgee catchment within the Murray–Darling basin, is located in the Australian Capital Territory, Australia.

Course

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 266 metres (873 ft) over its 26-kilometre (16 mi) 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]