- California40 objects
- North America40 objects
- Northeastern California✖Remove constraint Collection place: Northeastern California40 objects
- Northern California40 objects
- The Americas40 objects
- United States40 objects
- Siskiyou County, California14 objects
- Northern Sierras, Northern California13 objects
- Calaveras County, California10 objects
- Lower Klamath Lake Area, Siskiyou County, California10 objects
- Lower Klamath Lake, Siskiyou County, California10 objects
- CA-Sis-223, Lower Klamath Lake, Siskiyou County8 objects
- Shasta County, California8 objects
- CA-Cal-83, Calaveras County, California6 objects
- Amador County, California3 objects
- CA-Ama-3 (Bamert Cave), Amador County, California3 objects
- Modoc County, California3 objects
- CA-Cal-99 (Winslow Cave), Calaveras County, California2 objects
- CA-Sha-12, Shasta County, California2 objects
- CA-Sha-154, Shasta County, California2 objects