The 13th parallel south is a circle of latitude that is 13 degrees south of the Earth's equatorial plane. It crosses the Atlantic Ocean, Africa, the Indian Ocean, Australasia, the Pacific Ocean and South America.
Part of the border between Angola and Zambia is defined by the parallel.
Starting at the Prime Meridian and heading eastwards, the parallel 13° south passes through:
| Co-ordinates | Country, territory or sea | Notes | |
|---|---|---|---|
| Atlantic Ocean | |||
| / border | |||
| Lake Malawi | |||
| Passing through Pemba Bay | |||
| Indian Ocean | Mozambique Channel | ||
| Overseas department of Mayotte | |||
| Indian Ocean | Mozambique Channel | ||
| Indian Ocean | |||
| Timor Sea | |||
| Northern Territory | |||
| Gulf of Carpentaria | |||
| Cape York Peninsula, Queensland | |||
| Coral Sea | Passing just north of the Torres Islands, | ||
| Pacific Ocean | Passing north of Wallis Island, | ||
| Rondônia - for about 3 km | |||
| For about 12 km | |||
| Rondônia Mato Grosso Goiás Tocantins Goiás Tocantins Goiás Bahia - mainland, Itaparica Island and the mainland again (city of Salvador) | |||
| Atlantic Ocean |