The 30th parallel south is a circle of latitude that is 30 degrees south of the Earth's equator. It stands one-third of the way between the equator and the South Pole and crosses Africa, the Indian Ocean, Australia, the Pacific Ocean, South America and the Atlantic Ocean. At this latitude the sun is visible for 14 hours, 5 minutes during the summer solstice and 10 hours, 13 minutes during the winter solstice. At solar noon on December 21, the sun is at 83.83 degrees up in the sky and at 36.17 degrees on June 21.

Around the world

Starting at the Prime Meridian and heading eastwards, the parallel 30° south passes through: ! scope="col" width="125" | Coordinates ! scope="col" | Country, territory or ocean ! scope="col" | Notes ! scope="row" style="background:#b0e0e6;" | Atlantic Ocean ! scope="row" | 🇿🇦 ! scope="row" | 🇱🇸 ! scope="row" | 🇿🇦 ! scope="row" style="background:#b0e0e6;" | Indian Ocean ! scope="row" | 🇦🇺 ! scope="row" style="background:#b0e0e6;" | Pacific Ocean ! scope="row" | 🇨🇱 ! scope="row" | 🇦🇷 ! scope="row" | 🇧🇷 ! scope="row" style="background:#b0e0e6;" | Atlantic Ocean