Geography & Countries
Nations, borders, and the numbers that separate them.
The Most Visited National Parks in the United States
Great Smoky Mountains led the U.S. national parks with 11.5 million recreation visits in 2025, ahead of Zion and Yellowstone: 20 parks ranked by NPS visitor counts, with 2024 change, states, year established and acres.
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The Longest Cave Systems in the World
Mammoth Cave in Kentucky leads with 685.6 km of surveyed passage, ahead of Ox Bel Ha, Shuanghedong and Sac Actun: 14 cave systems ranked by surveyed length as of October 2026, with country, type of cave and the date of each figure.
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The Best U.S. Cities to Retire in 2026
Orlando, Miami and Tampa lead WalletHub's 2026 ranking of the best U.S. cities to retire, which scores 182 cities on affordability, activities, quality of life and health care. Here are the top 25.
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The Deepest Lakes in Africa
Tanganyika plunges 1,470 m — and giant Lake Victoria misses the cut.
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The Most Populous Countries in the World
All 236 countries and territories, ranked by 2026 population: from India's 1.48 billion down to Niue's 1,822 people.
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The World's Top Universities: THE World University Rankings 2027
Oxford leads Times Higher Education's World University Rankings 2027 for an 11th straight year, just 0.1 points ahead of MIT. These are the world's top 20 universities, with their overall scores and last year's ranks.
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African Countries That Drive on the Left
Fourteen African countries and two British island territories keep left. Here is every one, with the borders where drivers have to switch to the right.
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The African Countries Losing the Most Forest
Average annual net forest loss over 2010–2020 from FAO's Global Forest Resources Assessment 2020: DR Congo lost about 1.1 million hectares a year, twice as much as Angola.
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The Most Forested Countries in Africa
African countries ranked by total forest area in FAO's Global Forest Resources Assessment 2020, with each country's 1990 figure to show three decades of change. DR Congo holds 126.2 million hectares, almost twice as much as second-placed Angola.
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The Countries with the Most Registered Voters
Countries ranked by the number of people on the electoral roll at their most recent national election. The years differ by country (2023 to 2026), and registered voters are not the same as everyone eligible to vote.
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The Tallest Mountains in North America
From Denali to Mexico's volcanoes — North America's tallest peaks.
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The Tallest Mountains in Europe
The Caucasus beats the Alps — Europe's tallest peaks, by elevation.
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