The Donna O'Neill Land Conservancy (TDOLC) is the steward for a wilderness reserve located in the coastal foothills of Orange County, California. Our mission is to protect the rich natural and cultural resources of the San Mateo Watershed by providing opportunities for environmental education, biological research, and sensitive recreational access to Conservancy lands.

TDOLC is a non-profit 501(c)(3) corporation managed by a part-time staff and a volunteer Board of Directors representing the County of Orange, the City of San Clemente, and Rancho Mission Viejo.

TDOLC provides opportunities for the community to experience the beauty and solitude of Orange County wildlands, drawing visitors from as far away as Los Angeles, Riverside, and San Diego Counties. We provide a range of programs–from nature walks to astronomy nights.

Learn more about our current offerings in our website Calendar.

The Conservancy seeks your involvement as a program participant, volunteer and member!