Lane Cove River

Lane Cove River
A youthful tide-dominated, drowned valley estuary
Lane Cove River at night, showing the Fig Tree Bridge
Country	Australia
State	New South Wales
Region	Sydney basin (IBRA)
LGAs	Hornsby, Ryde, Lane Cove
Part of	Parramatta River catchment, Sydney Basin
Tributaries
- left	Gore Creek
- right	Devlins Creek, Terrys Creek
Source	Thornleigh Park
- location	Thornleigh
- coordinates	33°44′5.9994″S 151°5′20.3994″E / 33.734999833°S 151.088999833°E / -33.734999833; 151.088999833
Source confluence	Scout Creek
- location	Lane Cove National Park at Cheltenham
- coordinates	33°44′41.9994″S 151°5′24″E / 33.744999833°S 151.09000°E / -33.744999833; 151.09000
Mouth	Parramatta River
- location	Greenwich Point and Woolwich
- coordinates	33°50′32.3998″S 151°10′38.3988″E / 33.842333278°S 151.177333000°E / -33.842333278; 151.177333000Coordinates: 33°50′32.3998″S 151°10′38.3988″E / 33.842333278°S 151.177333000°E / -33.842333278; 151.177333000
Length	15 km (9 mi)
Width	3.0 km (2 mi)
Depth	4.2 m (14 ft)
Volume	12,600 m3 (444,965 cu ft)
NASA satellite view of Greater Metropolitan Sydney, with the location of the mouth of the Lane Cove River as it flows into the Parramatta River, as marked

The Lane Cove River, a northern tributary of the Parramatta River, is a youthful tide-dominated, drowned valley estuary west of Sydney Harbour, located in Sydney, New South Wales, Australia. The picturesque river is a tributary of the Parramatta River, winding through a peaceful bushland valley. It joins Parramatta River at Greenwich and Woolwich, where together they form an arm of Sydney Harbour.

The Lane Cove River rises near Thornleigh and flows generally south for about 15 kilometres (9.3 mi). Its catchment area is approximately 95.4 square kilometres (36.8 sq mi).

The upper reaches are in a narrow, forested valley eroded into the North Shore Plateau. The middle reaches are impounded by a weir just upstream of Fullers Bridge. Sections of the valley are richly forested and are protected within the Lane Cove National Park, an area of 598 hectares (1,480 acres), formerly a State Recreation Area. The lower reaches of the Lane Cove River, downstream from the weir near Fullers Bridge, are tidal and merge into Sydney Harbour at Greenwich and Woolwich. There are significant areas of mangrove communities along the shores.

The confluence of the river is with Scout Creek in Lane Cove National Park at Cheltenham. At North Epping, still within the confines of the national park, it is joined by Devlins Creek from the south and Terrys Creek near Macquarie Park. South–west of Killara and Lindfield, the width of the river expands, continuing south through Lane Cove River National Park, towards the suburbs of Linley Point and Riverview, before finally reaching its mouth between Greenwich Point and Woolwich, where it merges with Parramatta River and soon after becomes part of Port Jackson, more commonly known as Sydney Harbour.