The 1st parallel south is a circle of latitude that is 1 degree (69.2 miles/111.36 kilometers) south of the Earth's equatorial plane. It crosses the Atlantic Ocean, Africa, the Indian Ocean, Southeast Asia, Australasia, the Pacific Ocean and South America. The parallel defines most of the border between Uganda and Tanzania, and a very short section of the border between Kenya and Tanzania.

Around the world

Starting at the Prime Meridian and heading eastwards, the parallel 1° south passes through: ! scope="col" width="110" | Coordinates ! scope="col" | Country, territory or sea ! scope="col" | Notes ! scope="row" style="background:#b0e0e6;" | Atlantic Ocean ! scope="row" | 🇬🇦 ! scope="row" | 🇨🇬 ! scope="row" | 🇨🇩 ! scope="row" | 🇺🇬 ! scope="row" | 🇺🇬 / 🇹🇿 border ! scope="row" | 🇰🇪 / 🇹🇿 border ! scope="row" | 🇰🇪 ! scope="row" | 🇸🇴 ! scope="row" style="background:#b0e0e6;" | Indian Ocean ! scope="row" | 🇮🇩 ! scope="row" style="background:#b0e0e6;" | Mentawai Strait ! scope="row" | 🇮🇩 ! scope="row" style="background:#b0e0e6;" | Karimata Strait ! scope="row" | 🇮🇩 ! scope="row" style="background:#b0e0e6;" | Makassar Strait ! scope="row" | 🇮🇩 ! scope="row" style="background:#b0e0e6;" | Gulf of Tomini ! scope="row" | 🇮🇩 ! scope="row" style="background:#b0e0e6;" | Banda Sea ! scope="row" | 🇮🇩 ! scope="row" style="background:#b0e0e6;" | Molucca Sea ! scope="row" | 🇮🇩 ! scope="row" style="background:#b0e0e6;" | Halmahera Sea ! scope="row" | 🇮🇩 ! scope="row" style="background:#b0e0e6;" | Cenderawasih Bay ! scope="row" | 🇮🇩 ! scope="row" style="background:#b0e0e6;" | Cenderawasih Bay ! scope="row" | 🇮🇩 ! scope="row" style="background:#b0e0e6;" | Pacific Ocean ! scope="row" | 🇪🇨 ! scope="row" style="background:#b0e0e6;" | Pacific Ocean ! scope="row" | 🇪🇨 ! scope="row" | 🇵🇪 ! scope="row" | 🇨🇴 ! scope="row" | 🇧🇷 ! scope="row" style="background:#b0e0e6;" | Atlantic Ocean