Earth Sandwich / City antipodes / Hanoi
Antipode finder · Vietnam
The antipode of
Hanoi.
Draw a straight line from Hanoi (21.02° N, 105.84° E) through the centre of the Earth and it comes out at 21.02° S, 74.16° W, in the South Pacific Ocean, 411 km from the nearest dry land, off the coast of Chile. The other slice of an Earth sandwich would sink.
- Hanoi
- 21.02° N, 105.84° E · about 40 m above sea level · 8,053,663 people
- Antipode
- 21.02° S, 74.16° W
- What is there
- The South Pacific Ocean; the sea floor there lies about 4,760 m below the surface
- Nearest dry land
- 411 km from the antipode, on the coast of Chile
- Nearest town
- Tocopilla, Chile · 426 km from the antipode
- Nearest big city
- Arequipa · 584 km from the antipode
- Sandwich verdict
- SOGGY the other slice lands in open water
- Nearest exact spot
- 413 km away, near Leizhou, China ⇄ 84 km from Alto Hospicio, Chile
Can you make an Earth sandwich from Hanoi?
No, not from Hanoi itself. The other slice would land in the South Pacific Ocean, 411 km from the nearest dry land (Chile), where the sea floor lies about 4,760 m below the surface. Boats do not count (Sandwich Law § 1.3).
The nearest place from which an exact Earth sandwich is possible is 413 km from Hanoi, 29 km from Leizhou, China. Its other slice would go down 84 km from Alto Hospicio, Chile.
Hanoi is on the Vietnam, Cambodia & Thailand ↔ Peru 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.