Earth Sandwich / City antipodes / Gustavo Adolfo Madero
Antipode finder · Mexico
The antipode of
Gustavo Adolfo Madero.
Draw a straight line from Gustavo Adolfo Madero (19.49° N, 99.11° W) through the centre of the Earth and it comes out at 19.49° S, 80.89° E, in the Indian Ocean, 1,621 km from the nearest dry land, off the coast of the British Indian Ocean Territory. The other slice of an Earth sandwich would sink.
- Gustavo Adolfo Madero
- 19.49° N, 99.11° W · about 2,280 m above sea level · 1,185,772 people
- Antipode
- 19.49° S, 80.89° E
- What is there
- The Indian Ocean; the sea floor there lies about 4,920 m below the surface
- Nearest dry land
- 1,621 km from the antipode, on the coast of the British Indian Ocean Territory
- Nearest town
- Downtown, British Indian Ocean Territory · 1,641 km from the antipode
- Nearest big city
- Bandar Lampung · 3,066 km from the antipode
- Sandwich verdict
- SOGGY the other slice lands in open water
- Nearest exact spot
- 2,061 km away, 35 km from Lamar, United States ⇄ 1,412 km from Port-aux-Français, French Southern Territories
Can you make an Earth sandwich from Gustavo Adolfo Madero?
No, not from Gustavo Adolfo Madero itself. The other slice would land in the Indian Ocean, 1,621 km from the nearest dry land (the British Indian Ocean Territory), where the sea floor lies about 4,920 m below the surface. Boats do not count (Sandwich Law § 1.3).
The nearest place from which an exact Earth sandwich is possible is 2,061 km from Gustavo Adolfo Madero, 35 km from Lamar, United States. Its other slice would go down 1,412 km from Port-aux-Français, French Southern Territories.
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.