The Richard & Donna O'Neill Conservancy is 1,200 acres of preserved open space located on The Reserve at Rancho Mission Viejo, a growing habitat reserve in Southeast Orange County. Reserve lands–including the Conservancy–are managed by the Rancho Mission Viejo Land Trust, a non-profit 501(c)(3) organization whose mission is "to preserve and enhance Reserve lands for ecological, educational, charitable, conservation, open space, scientific, and recreational uses."