The 42nd parallel south is a circle of latitude that is 42 degrees south of the Earth's equatorial plane. It crosses the Atlantic Ocean, the Indian Ocean, Australasia, the Pacific Ocean and South America.
At this latitude the sun is visible for 15 hours, 15 minutes during the December solstice and 9 hours, 7 minutes during the June solstice.
Starting at the Prime Meridian and heading eastwards, the parallel 42° south passes through:
| Co-ordinates | Country, territory or sea | Notes |
|---|---|---|
| Atlantic Ocean | ||
| Indian Ocean | ||
| Australia | Tasmania | |
| Pacific Ocean | Tasman Sea | |
| New Zealand | South Island | |
| Pacific Ocean | ||
| Chile | Chiloé Island | |
| Gulf of Ancud | ||
| Chile | ||
| Argentina | The parallel defines the border between Río Negro Province and Chubut Province | |
| Atlantic Ocean |
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