Earth Sandwich / City antipodes / Tangshan
Antipode finder · China
The antipode of
Tangshan.
Draw a straight line from Tangshan (39.64° N, 118.18° E) through the centre of the Earth and it comes out at 39.64° S, 61.82° W, in the South Atlantic Ocean, 24 km from the nearest dry land, off the coast of Argentina. A deli-grade Earth sandwich is possible.
- Tangshan
- 39.64° N, 118.18° E · about 40 m above sea level · 3,372,102 people
- Antipode
- 39.64° S, 61.82° W
- What is there
- The South Atlantic Ocean; the sea floor there lies about 40 m below the surface
- Nearest dry land
- 24 km from the antipode, on the coast of Argentina
- Nearest town
- Juan A. Pradere, Argentina · 72 km from the antipode
- Nearest big city
- Buenos Aires · 637 km from the antipode
- Sandwich verdict
- DELI dry land within 50 km of the antipode
Can you make an Earth sandwich from Tangshan?
Nearly: a deli-grade Earth sandwich. The antipode of Tangshan lies in the South Atlantic Ocean, 24 km from the nearest dry land in Argentina. Sandwich Law allows a slice within 50 km of the true antipode, and the verifying grid rates Tangshan deli, so bread in Tangshan and bread near Juan A. Pradere, Argentina still count as one sandwich. The elevation bonus depends on the spot chosen for the dry slice.
Tangshan is on the China & Mongolia ↔ Argentina & Chile 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.