BOUNDARY MON 166 RM 1
| Coordinates: | N 31.866049° W 112.771073° (estimate) |
| Location: | Arizona
Pima County South of Lukeville Quad |
| Elevation: | Unknown |
| Type: | Reference Mark Disk |
| Setting: | Unknown Setting |
| Year Established: | 1936 |
| Established By: | International Boundary and Water Commission |
| Status: | Not Found |
| Condition: | Unknown (Not Found) as of March 27, 2019 |
For more information, see: BOUNDARY MON 166 MX US