Earth Sandwich / City antipodes / Ottawa
Antipode finder · Canada
The antipode of
Ottawa.
Draw a straight line from Ottawa (45.41° N, 75.70° W) through the centre of the Earth and it comes out at 45.41° S, 104.30° E, in the Indian Ocean, 1,533 km from the nearest dry land, off the coast of Australia. The other slice of an Earth sandwich would sink.
- Ottawa
- 45.41° N, 75.70° W · about 120 m above sea level · 1,017,449 people
- Antipode
- 45.41° S, 104.30° E
- What is there
- The Indian Ocean; the sea floor there lies about 3,560 m below the surface
- Nearest dry land
- 1,533 km from the antipode, on the coast of Australia
- Nearest town
- Augusta, Australia · 1,540 km from the antipode
- Nearest big city
- Perth · 1,798 km from the antipode
- Sandwich verdict
- SOGGY the other slice lands in open water
- Nearest exact spot
- 2,362 km away, near Shellbrook, Canada ⇄ 477 km from Port-aux-Français, Heard Island and McDonald Islands
Can you make an Earth sandwich from Ottawa?
No, not from Ottawa itself. The other slice would land in the Indian Ocean, 1,533 km from the nearest dry land (Australia), where the sea floor lies about 3,560 m below the surface. Boats do not count (Sandwich Law § 1.3).
The nearest place from which an exact Earth sandwich is possible is 2,362 km from Ottawa, 16 km from Shellbrook, Canada. Its other slice would go down 477 km from Port-aux-Français, Heard Island and McDonald Islands.
Ottawa is on the The US & Canada ↔ the southern Indian Ocean 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.