Earth Sandwich / City antipodes / San Antonio
Antipode finder · United States
The antipode of
San Antonio.
Draw a straight line from San Antonio (29.42° N, 98.49° W) through the centre of the Earth and it comes out at 29.42° S, 81.51° E, in the Indian Ocean, 1,000 km from the nearest dry land, off the coast of the French Southern Territories. The other slice of an Earth sandwich would sink.
- San Antonio
- 29.42° N, 98.49° W · about 280 m above sea level · 1,526,656 people
- Antipode
- 29.42° S, 81.51° E
- What is there
- The Indian Ocean; the sea floor there lies about 4,280 m below the surface
- Nearest dry land
- 1,000 km from the antipode, on the coast of the French Southern Territories
- Nearest town
- Port Mathurin, Mauritius · 2,122 km from the antipode
- Nearest big city
- Perth · 3,283 km from the antipode
- Sandwich verdict
- SOGGY the other slice lands in open water
- Nearest exact spot
- 1,001 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 San Antonio?
No, not from San Antonio itself. The other slice would land in the Indian Ocean, 1,000 km from the nearest dry land (the French Southern Territories), where the sea floor lies about 4,280 m below the surface. Boats do not count (Sandwich Law § 1.3).
The nearest place from which an exact Earth sandwich is possible is 1,001 km from San Antonio, 35 km from Lamar, United States. Its other slice would go down 1,412 km from Port-aux-Français, French Southern Territories.
San Antonio 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.