Sydneysiders can walk a 65 kilometre track from Parramatta to the Blue Mountains under the NSW government's ambition to create a green grid of open spaces and nature reserves across the city.

The Great West Walk is the first continuous walking trail to traverse Sydney's western suburbs, weaving through parks, bushland and the city centres of Parramatta, Blacktown and Penrith.

The Great West Walk is a 65km walking route stretching from Parramatta to the foot of the Blue Mountains Credit:greatwestwalk.com

The route forms part of the Berejiklian government's green grid – a network of walkways, cycleways and open spaces through which people can or should be able to walk through the city's suburbs.

Planning and Public Spaces Minister Rob Stokes said the project represented "a vision that is being turned into reality" as he opened the walking track on the route at Parramatta Park.