GeoDuo
DAILY CHALLENGE

Which two countries does it separate?

Drag to explore. Use the wheel or two fingers to zoom. Rotate with two fingers or Shift-drag. Select a guess to locate its countries.

Above 100% zoom, drag to pan. At 100% or below, drag to rotate. Hold Shift while dragging or use the arrow keys to rotate at any zoom. Press Home or the compass to restore north. Use the plus and minus buttons, mouse wheel, + and − keys or two fingers to zoom between 75% and 250%. Press 0 or the percentage to reset and center the map. Hide the panels to explore the full map. The background is decorative and does not represent real terrain.

Use two fingers to zoom and rotate the map at the same time. When zoomed in, drag one finger to pan. The compass restores north and the percentage resets the zoom. Zoom ranges from 75% to 250%.

HOW TO PLAY

One line. Two countries.

Identify the two countries or territories that share the displayed border.

  1. Select two countries and press Check. The order does not matter.
  2. You have six attempts. Correct names appear in green and can be kept in the next answer.
  3. Each incorrect answer unlocks a clue: regions, length, one country’s outline, the other’s outline, and finally both initials.
Neither country correct
One country correct: keep that name
Both countries correct: challenge completed
Map controls

Use two fingers to zoom and rotate the map at the same time. When zoomed in, drag one finger to pan. The compass restores north and the percentage resets the zoom. Zoom ranges from 75% to 250%.

At the initial size, drag the border to rotate it through 360°. Above 100% zoom, drag to explore; hold Shift to keep rotating. The compass points north: press it to smoothly restore the initial orientation. You can also use the arrow keys and Home. Zoom with +/−, the mouse wheel or a two-finger pinch. Zoom ranges from 75% to 250%; press the percentage to reset to 100% and center the map.

The border fits the view, without a kilometer scale that would reveal the length hint. The background terrain is decorative; some borders have several sections.

Each game is saved only in this browser. Use the history to play earlier challenges or continue unfinished ones. Challenges change at 00:00 UTC. Everyone follows the same schedule, without repeats until all 342 borders have been played.

About the borders

Includes all shared borders represented in the Natural Earth map data, including territories and disputed areas. Maritime borders are excluded. The boundaries reflect that source: examples of missing borders include Canada–Greenland and the short Botswana–Zambia section. This is not an official inventory of all current borders.

Overseas regions are grouped according to the source. A pair of countries may share several border sections, which are shown together.

KEEP EXPLORING

A new border every day.

Choose a day to play. Your progress is saved in this browser.

0Current streak
0Best streak

Solve the challenge on its day (UTC) to extend your streak. History and streaks are saved in this browser.

Share result

Share your guesses without revealing the countries.

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GeoDuo v1.2
Your world, one border at a time
Every game counts. Every border expands your world.
GeoDuo
Your world, one border at a time
0Games played
—Win rate
0Current streak
0Best streak
Completed: 0Won: 0In progress: 0
Wins by guesses
Average: —
Win rate counts completed games only. The average includes wins only.
Progress is saved in this browser. Streaks only count puzzles solved on their day (UTC).