Cowan Creek is located in

New South Wales New South Wales (commonly abbreviated as NSW) is a States and territories of Australia, state on the Eastern states of Australia, east coast of :Australia. It borders Queensland to the north, Victoria (state), Victoria to the south, and South ...

Australia Australia, officially the Commonwealth of Australia, is a country comprising mainland Australia, the mainland of the Australia (continent), Australian continent, the island of Tasmania and list of islands of Australia, numerous smaller isl ...

. It is a tidal subcatchment of the

Hawkesbury River The Hawkesbury River, or Hawkesbury-Nepean River (Dharug language, Dharug: Dyarubbin) is a river located northwest of Sydney, New South Wales, Australia. The Hawkesbury River and its associated main tributary, the Nepean River, almost encircle ...

. Almost all of the catchment lies within

Ku-ring-gai Chase National Park Ku-ring-gai Chase National Park is a national park on the northern side of Sydney in New South Wales, Australia. The park is north of the Sydney central business district and generally comprises the land east of the Highway 1 (New South Wales ...

. Tributaries include

Coal and Candle Creek Coal is a combustible black or brownish-black sedimentary rock, formed as rock strata called coal seams. Coal is mostly carbon with variable amounts of other elements, chiefly hydrogen, sulfur, oxygen, and nitrogen. Coal is a type of fossi ...

, which branches off from Cowan Creek at Cottage Point and Smiths Creek.

Incidents

On December 31, 2017, a de Havilland Canada DHC-2 Beaver crashed into Jerusalem Bay just off Cowan Creek, killing 6 people. Creeks and canals of Sydney Hawkesbury River {{Sydney-geo-stub