For the more information about the air resources of the National Park Service, please visit http://www.nature.nps.gov/air/.
San Bernardino County, CA
National Natural Landmarks in this county include:
- Amboy Crater
- Cinder Cone Natural Area
- Mitchell Caverns and Winding Stair Cave
- Rainbow Basin
- Trona Pinnacles
- Turtle Mountains Natural Area
Please remember, National Natural Landmarks (NNLs) are not national parks. NNL status does not indicate public ownership, and many sites are not open for visitation.
Last Updated: June 28, 2012