The 11,785-hectare (29,120-acre) national park is situated approximately 40 kilometres (25 mi) northwest of the Sydney central business district.

The park is bounded by the Hawkesbury River in the north; Berowra Creek in the east; and private land to the south and west.

It offers bushwalkers a wide range of environments, from the mangrove communities along Marramarra Creek to the drier, sclerophyll scrub along the ridges.

Access is provided predominantly by fire trails and service roads, frequently alongside power lines, with no dedicated walking tracks.

Rock engravings, cave art, grinding grooves, scarred trees and other stone arrangements are part of this national park.