SizeGuess
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51 objects · Free category practice

Geography size guessing game

Resize countries and territories from real map outlines, alongside lakes and other geographic features. Country rounds compare the labelled map width or height, not land area. Each outline uses a locally centred equal-area projection.

The world is waiting.

Preparing your size challenge…

Explore the geography collection

Each five-round set is generated from this collection. Your category scores are separate from the mixed daily streak. Read the chosen dimension and measurement note after each reveal.

Browse all 51 measurementsRead the source conventionsPlay today’s mixed challenge
geography

Lake Superior

563 kmlength

Maximum published length, 350 miles, rounded to 563 km.

See the perspective
geography

Lake Michigan

494 kmlength

Published maximum length, rounded to 494 km.

See the perspective
geography

Lake Huron

332 kmlength

Published maximum length, rounded to 332 km.

See the perspective
geography

Lake Erie

388 kmlength

Published maximum length, rounded to 388 km.

Get a sense of scale.

  1. Find your reference.The object on the left has a known measurement. Check the height, length or diameter label.
  2. Resize your guess.Pull the corner of the coral silhouette, use the slider, or tap − / +. The green reference stays fixed. Fit view changes only the camera.
  3. Lock it in.The teal silhouette animates to its true size; your coral guess stays visible for comparison. Earn up to 100 points per round; five rounds make 500.
Full rules & scoring

Your perspective.

Play a set to start your personal history.

Share a perspective.

Same silhouettes. Same rounds. Who has the better eye?

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