Earth Sandwich / City antipodes / Antananarivo
Antipode finder · Madagascar
The antipode of
Antananarivo.
Draw a straight line from Antananarivo (18.91° S, 47.54° E) through the centre of the Earth and it comes out at 18.91° N, 132.46° W, in the North Pacific Ocean, 1,813 km from the nearest dry land, off the coast of Mexico. The other slice of an Earth sandwich would sink.
- Antananarivo
- 18.91° S, 47.54° E · about 1,240 m above sea level · 1,349,501 people
- Antipode
- 18.91° N, 132.46° W
- What is there
- The North Pacific Ocean; the sea floor there lies about 5,240 m below the surface
- Nearest dry land
- 1,813 km from the antipode, on the coast of Mexico
- Nearest town
- Bahía Tortugas, Mexico · 2,039 km from the antipode
- Nearest big city
- Tijuana · 2,159 km from the antipode
- Sandwich verdict
- SOGGY the other slice lands in open water
- Nearest exact spot
- 2,345 km away, 74 km from Gweta, Botswana ⇄ near Nanawale Estates, United States
Can you make an Earth sandwich from Antananarivo?
No, not from Antananarivo itself. The other slice would land in the North Pacific Ocean, 1,813 km from the nearest dry land (Mexico), where the sea floor lies about 5,240 m below the surface. Boats do not count (Sandwich Law § 1.3).
The nearest place from which an exact Earth sandwich is possible is 2,345 km from Antananarivo, 74 km from Gweta, Botswana. Its other slice would go down 11 km from Nanawale Estates, United States.
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.