A remote property linked to the ill-fated Burke and Wills expedition is set to become a national park.
The state government has announced the acquisition of the 153,415-hectare Narriearra Station in the far north west of NSW.
It is the government's "largest purchase of private land for national parks in the state's history".
The sale price has not been disclosed.
NSW Environment Minister Matt Kean said the purchase would help protect threatened species, important habitat and wetlands.
"Narriearra Station stretches across the outback Channel Country and includes part of the Bulloo River floodplain, ephemeral wetlands and landscapes currently not found anywhere in NSW national parks," he said.
"Narriearra is an important refuge for threatened wildlife, with more than 25 threatened animal species, including nearly 90 per cent of NSW's critical habitat and breeding areas for the nationally-endangered Grey Grasswren."
Mr Kean said the acquisition secured a key section of a nationally-important wetland, the Caryapundy Swamp, which could host tens of thousands of waterbirds including pelicans, straw-necked ibis, egrets and whiskered terns during inland flood events.
"Narriearra along with the nearby Sturt National Park, will create a vast near-contiguous conservation area of almost half a million hectares, or twice the size of the ACT," he said.
"Adjoining the Pindera Downs Aboriginal Area, Narriearra contains many significant and valuable stone artefacts, tools and stone arrangements.
"The property is also linked to the ill-fated Burke and Wills expedition, with two expedition campsites on the property."
Mr Kean has invited the Tibooburra Local Aboriginal Land Council to suggest a name for the new national park.
He said the purchase of the station would help exceed the goal of adding "200,000 hectares of land to the national parks estate".