The Earth Sandwich challenge
Make an Earth Sandwich:two slices, 12,742 km apart.
An Earth Sandwich is simple: you and a friend each place a slice of bread on the ground at exact antipodal points — the two spots on Earth that are diametrically opposite. The catch? Over 90% of land sits opposite open ocean, so most attempts end with a floating slice.
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The rules
How to make a real Earth Sandwich
Step 1
Find your antipode — the point exactly opposite you through the planet. Negate your latitude and shift your longitude by 180°.
Step 2
Recruit a partner at that spot. Both points must be on land — an ocean slice doesn't count.
Step 3
Both drop a slice of bread at the same moment. Congratulations: the filling is a 12,742 km column of rock, magma and molten iron.
Antipode checker
Where does your second slice land?
Pick a city or enter your coordinates. We'll compute the exact antipodal point and tell you whether your Earth Sandwich holds together — or floats away.
Second slice goes at 51.51° S, 179.87° E
🌊 Soggy bread — that's the South Pacific Ocean. Sandwich failed.
Try a different starting point — valid land-to-land pairs are rare, which is the whole point of the challenge.
The rare pairs
Where an Earth Sandwich is actually possible
Because Earth's land is lopsided, only a handful of land-to-land antipodal pairs exist. These are the realistic launchpads for your sandwich.
| Slice one | Slice two | Detail |
|---|---|---|
| Central & southern Spain | North Island, New Zealand | The classic pairing — Madrid and Wellington are almost antipodal. |
| Portugal | South Island, New Zealand | Lisbon's second slice lands near Christchurch. |
| Buenos Aires, Argentina | Eastern China | The Shanghai area — the only major city-to-city Earth Sandwich on Earth. |
| Central Chile | China (Shaanxi / Henan) | Santiago pairs with central China. |
| Taiwan | Paraguay | Taipei and Asunción sit almost exactly opposite each other. |
| Uruguay | Yellow Sea coast, China | Montevideo's bread lands just off the Chinese coast — check the tide. |
Everyone else — North America, the UK, most of Europe, Japan, Australia — is antipodal to open ocean. That's the same geometry behind the myth of digging to China.
See it, don't just read it
Drop the drill on the interactive map and watch it descend through the crust, mantle and 5,400 °C core to your exact antipodal bread spot — then share the coordinates with your sandwich partner.
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