The Lower Prospect Canal Reserve is a unique parcel of bushland that snakes through a densely populated area of western Sydney.
And this piece of land is under the constant watchful eye of land developers.
In 1994, a group of 100 concerned residents called for a meeting after coming across information that the land where the canal reserve is was to be sold.
Twenty years later the group, called CRAG (Canal Reserve Action Group), now has 12 members, but has not lost its strength, according to long-term Greystanes resident Steve Norton.
"There is no doubt we've contributed to keeping developers from building on that land," the retired IT project manager said.
"Over the years we've taken politicians, MPs and ministers to have a look and support our cause.
"This is the largest open space in Holroyd and it's a beautiful green corridor with amazing fauna and endangered flora."
After the canal became redundant in 1995 the group saw to it that the land would stay open for residents.
And in 2004 a seven kilometre cycleway was opened. "It's very flat and great for families because it goes under all the roads and there is no traffic through it," Mr Norton said.
The group are lobbying to get a pedestrian crossing bridge installed after the opening of the four-lane Prospect Highway in December.