The 42nd parallel south is a circle of latitude that is 42 degrees south of the Earth's equatorial plane.
Starting at the Prime Meridian and heading eastwards, the parallel 42° south passes through:
| Country, territory or sea | Notes |
|---|---|
| Atlantic Ocean | |
| Indian Ocean | |
| Tasmania | |
| Pacific Ocean | Tasman Sea |
| South Island | |
| Pacific Ocean | |
| Chiloé Island and mainland | |
| The parallel defines the border between Río Negro Province and Chubut Province | |
| Atlantic Ocean |
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