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Guess the real numbers behind the world's valleys, see how everyone else guessed, and get the source.
About how many people visit Napa Valley each year?
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Real figures with their sources. All Valley facts →
about 6,500 km (4,000 mi)
The Great Rift Valley stretches roughly 6,500 kilometers across the Middle East and Africa, one of the longest continuous rift systems on Earth.
Source: Wikipedia, Great Rift Valley (2023) en.wikipedia.org
January 28, 1981
Napa Valley became the nation's second official American Viticultural Area on January 28, 1981, decades after its first vineyard was planted in 1838.
Source: Wikipedia, Napa Valley AVA (2024) en.wikipedia.org
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Each question asks you to guess a real number about valleys -- famous landforms around the world. After you answer you see how everyone else guessed, then the real figure and where it comes from.
Four stats and one opinion poll. A correct guess earns 100 points plus up to 50 for speed, with a combo bonus for answers in a row. The range next to the right answer earns 40. Opinion polls earn 25 for having your say, and nailing every stat adds 150.
Every stat links to its source, such as government statistics agencies, research organizations and industry groups. Figures are checked against the source before they go live.
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