Map Tunnel
Pick a point on the left map and watch its antipode appear on the right — two synchronized maps showing both ends of an imaginary tunnel through the Earth.
…or click the left map. Zoom either map — the other follows.
Start
Where the tunnel emerges
A straight tunnel through the planet always emerges at the antipode — latitude flipped, longitude shifted 180°, about 12,742 km away through the Earth.
How to use this tool
Search a place or click the left map.
The right map jumps to the antipode automatically.
Zooming either map keeps the other at the same level.
What people use this tool for
Make antipodes tangible with a side-by-side visual.
See what lies beneath the opposite side of your city.
A striking visual for talks about Earth's geometry.
How it's calculated
Both maps are Leaflet instances; zoom events are synchronized with a re-entrancy guard. The antipode is computed by negating latitude and shifting longitude 180°, then reverse-geocoded for a human-readable label.
Related tools and resources
Frequently asked questions
What is a map tunnel?
A playful visualization: pick a point, and the second map shows where you'd emerge digging straight through Earth.
Are the two maps linked?
Zoom levels stay synchronized; each map centers on its own end of the tunnel.
How long would the tunnel be?
About 12,742 km — Earth's diameter — for any starting point.
Why does the far map often show ocean?
Because ~85% of land antipodes fall in the ocean.
Can I search for a city instead of clicking?
Yes — the search box sets the start point on the left map.
What does the label under the right map mean?
The nearest named place to the emergence point, via reverse geocoding.
Does panning one map move the other?
No — only zoom is synced; each map stays centered on its tunnel end.
Is this scientifically accurate?
The geometry is exact; the 'tunnel' itself is a thought experiment.