They are at Balmangan Farm, Moss of Cree and Nature at Spott.
The Northwoods Rewilding Network was launched in April 2021 by rewilding charity SCOTLAND: The Big Picture.
The size of partner sites ranges from 50 to 1000 acres, and Northwoods now covers more than 13,000 acres.
Each site makes rewilding commitments tailored to them, which may include the expansion or enrichment of native woodlands, the restoration of carbon-storing wetlands or the creation of wildlife corridors to allow animals to roam freely across the landscape.
Project lead James Nairne said: “The thread that runs through the Northwoods Rewilding Network is a determination to be part of the solution to climate breakdown and biodiversity loss.
“What’s taken us by surprise is the strength of the appetite. From Sutherland to the Solway Firth, this is a landowner-driven aspiration.
“Rewilding is ultimately about restoring dynamic natural processes.”