SizeGuess
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6 objects · Free category practice

Geography size guessing game

Compare the published lengths of lakes and other geographic features. The drawings are schematic icons, not map outlines; the specified length is what the game measures.

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 6 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.

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geography

Lake Erie

388 kmlength

Published maximum length, rounded to 388 km.

Get a sense of scale.

  1. Find your reference.The forest-green shape has a known measurement. Check the height, length or diameter label.
  2. Resize your guess.Use the slider, the − / + buttons, or drag sideways on the board. Arrow keys adjust the slider.
  3. Lock it in.The teal outline reveals the recorded true size. Earn up to 100 points per round; five rounds make 500.
Full rules & scoring

Your perspective.

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