Earth Sandwich / City antipodes / Porto Alegre
Antipode finder · Brazil
The antipode of
Porto Alegre.
Draw a straight line from Porto Alegre (30.03° S, 51.23° W) through the centre of the Earth and it comes out at 30.03° N, 128.77° E, in the East China Sea, 74 km from the nearest dry land, off the coast of Japan. A sloppy Earth sandwich is possible.
- Porto Alegre
- 30.03° S, 51.23° W · about 40 m above sea level · 1,488,252 people
- Antipode
- 30.03° N, 128.77° E
- What is there
- The East China Sea; the sea floor there lies about 920 m below the surface
- Nearest dry land
- 74 km from the antipode, on the coast of Japan
- Nearest town
- Kurio, Japan · 161 km from the antipode
- Nearest big city
- Fukuoka · 426 km from the antipode
- Sandwich verdict
- SLOPPY dry land within 200 km of the antipode
Can you make an Earth sandwich from Porto Alegre?
Nearly: a sloppy-grade Earth sandwich. The antipode of Porto Alegre lies in the East China Sea, 74 km from the nearest dry land in Japan. Sandwich Law allows a slice within 200 km of the true antipode, and the verifying grid rates Porto Alegre sloppy, so bread in Porto Alegre and bread near Kurio, Japan still count as one sandwich. The elevation bonus depends on the spot chosen for the dry slice.
Porto Alegre is on the Okinawa & Jeju ↔ southern Brazil 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.