Earth Sandwich / City antipodes / Onitsha
Antipode finder · Nigeria
The antipode of
Onitsha.
Draw a straight line from Onitsha (6.15° N, 6.79° E) through the centre of the Earth and it comes out at 6.15° S, 173.21° W, in the South Pacific Ocean, 211 km from the nearest dry land, off the coast of Kiribati. The other slice of an Earth sandwich would sink.
- Onitsha
- 6.15° N, 6.79° E · about 40 m above sea level · 1,553,000 people
- Antipode
- 6.15° S, 173.21° W
- What is there
- The South Pacific Ocean; the sea floor there lies about 5,560 m below the surface
- Nearest dry land
- 211 km from the antipode, on the coast of Kiribati
- Nearest town
- Atafu Village, Tokelau · 277 km from the antipode
- Nearest big city
- Auckland · 3,625 km from the antipode
- Sandwich verdict
- SOGGY the other slice lands in open water
- Nearest exact spot
- 818 km away, near Maradi, Niger ⇄ near Asau, Samoa
Can you make an Earth sandwich from Onitsha?
No, not from Onitsha itself. The other slice would land in the South Pacific Ocean, 211 km from the nearest dry land (Kiribati), where the sea floor lies about 5,560 m below the surface. Boats do not count (Sandwich Law § 1.3).
The nearest place from which an exact Earth sandwich is possible is 818 km from Onitsha, 15 km from Maradi, Niger. Its other slice would go down 13 km from Asau, Samoa.
Onitsha is on the The South Pacific ↔ the Sahara & Sahel corridor. Its guide lists where every city on both sides lands and how to make an Earth sandwich there.
How this was worked out: the antipode flips the latitude and moves the longitude by 180°. Land or sea comes from the OpenStreetMap coastline the map uses; the sandwich verdict and elevations come from the verifier's 0.2° grid (Natural Earth land, ETOPO 2022 relief); water names from Natural Earth; towns and populations from GeoNames. The city's position is GeoNames' point for it; a big city's suburbs spread tens of kilometres around that point, and the figures move with them. Generated 2026-09-29.