The area of Ku-ring-gai National Park bounded by Terrey Hills, Duffys Forest and Cowan Creek hides many Aboriginal art sites. About half the sites are shelters along Cowan Creek, and the rest are engraving, cave art and grinding grooves along the many ridges and spurs.
The Big Man, Small Man Aboriginal engraving site has three male figures. The largest is over six metres high, and the smallest just over a metre.
A complex Aboriginal engraving site near Cotton Tree Creek. The figures include at least two whales and a man, as well over 40 axe grinding grooves.
Above Cowan Creek a small and remote site with a carving of a striped bandicoot, and two spirit figures.
Red ochre handprints and possible charcoal cave art in a small shelter below the Cowan Track.
Aboriginal engravings of a large macropod and two smaller figures near the Duckholes Trail.
An Aboriginal engraving of an axe and a second indeterminate figure, near the Long Track.
A complex Aborigial engraving site across multiple adjacent platforms, which includes a very long line of footprints (mundoes) and a depiction of Baiame.
Hand stencils and what may be a stencil of a boomerang in red ochre in a shallow overhang near the Long Trail.
An Aboriginal engraving site which may represent a hunting scene, on the western side of the Long Trail
Long Trail Trig is an Aboriginal engraving site described as a "remarkable ceremonial group" with a deity and two composite beings.