County Maps US

Tools Coordinates

Map Tunnel

The antipode finder as a toy: pan either map and the other follows to the opposite point.

How to use it

  1. Drag either map. The crosshair in the middle marks the tunnel entrance; the other map centres on the exit.
  2. Zoom in on one side to look at the exact spot; the other side zooms with it.
  3. The lines under the maps name the country or ocean under each crosshair.

How it works

Each map reports its centre as it moves and the other map is set to the antipode of that centre (latitude negated, longitude plus 180 degrees) at the same zoom. A flag stops the two maps from bouncing updates back and forth. The country under each crosshair comes from Natural Earth 1:110m outlines tested in the browser; small islands are not in that file and show as ocean.

Questions

Why is the other side almost always ocean?
Because 71 percent of the surface is ocean and the continents happen to sit mostly opposite the sea. Start from Spain, Argentina or Hawaii to land on the other side.
Could a tunnel really go through the Earth?
No; the core is about 5,000 degrees Celsius. As a thought experiment, an object dropped through a frictionless tunnel would reach the other side in about 42 minutes.

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