Geography is a way to understand the planet we live on. Mountains, trenches, artificial islands, and lakes on islands in lakes, the world is fascinating. Here are just a few of our favourite geography facts and trivia.
Earth's Unique Geographical Features
I began studying geography because I wanted to learn more about the world I live in.
Alice Hyde
The Earth has plenty of natural landmarks formed by mighty geological forces. From ocean trenches to towering mountains, these features are more than impressive; they help scientists understand how the planet formed. Here are just two of the most important ones.
The Deepest Point on Earth
The Mariana Trench in the western Pacific Ocean is one of the most extreme locations on Earth.⁴ Formed by tectonic plate movement, one plate was forced beneath another, which created a deep underwater valley.⁴ The trench helps scientists studying areas of geography like earthquakes, plate tectonics, and deep-sea ecosystems.
Even the Mariana Trench isn't "out of reach." The deepest known spot, Challenger Deep, has been visited by crewed and uncrewed missions. Still, exploration remains difficult because of crushing pressure, near-freezing temperatures, and total darkness.
metres below sea level.²
The Tallest Mountain from Base to Summit
Generally, Mount Everest is considered the tallest mountain on Earth.⁸ By measuring from sea level, Everest is the highest. Sitting on the border of Nepal and China, it's a popular climbing destination, too.
metres above sea level.⁸
However, if you measure from where a mountain begins (if you can agree on that), Mauna Kea in Hawaii surpasses Everest.³ This is because Mauna Kea rises from the ocean floor and then above the ground. Of course, it depends on how you're measuring as to which mountain is really the tallest.
metres from its ocean floor base to its peak.³
Unusual Geographical Phenomena
Geography can surprise us with unbelievable geographical events. Rivers behaving unpredictably or areas that were completely different not too long ago in geographic terms. Weird geographical phenomena can teach geographers a lot about environmental shifts.
The River That Flows Backward
One of our fascinating geography facts involves the Amazon River. It's the largest river system on Earth by volume, and sometimes, it flows backwards! A tidal phenomenon known as the Pororoca causes ocean tides to push seawater upstream into the Amazon, reversing the river's natural flow.⁶
Waves can travel long distances inland, altering water levels and river currents. The Pororoca is possible because the river meets a large body of water. Scientists and famous geographers have studied the phenomenon and learned about sediment movement, ecosystem changes, and flood risks in coastal river systems.⁹
The Desert That Was Once a Lush Paradise
If you think about the Sahara Desert, you'll likely imagine a lot of sand. Currently, the largest hot desert on Earth covers vast stretches of North Africa.⁴ However, thousands of years ago, the region was very different. During the African Humid Period, the Sahara was a green savannah, complete with lakes, rivers, grasslands, and wildlife. Eventually, rainfall patterns changed, monsoon activity decreased, and vegetation declined; lakes dried up, and desert conditions spread across the region.
~11,000 – 5,000 years ago
African Humid Period
The Sahara was a fertile, green landscape, home to lakes, rivers, grasslands, and wildlife. Early human populations lived throughout the region, supported by rainfall and vegetation.
~5,000 years ago
Climate Shift Begins
Changes in Earth's orbit altered monsoon patterns. Rainfall began decreasing, slowly transforming grasslands into dry savannah and semi-arid terrain.
~3,000 years ago
Expansion of Desert Conditions
Drying accelerated across North Africa. Lakes shrank or disappeared, wildlife migrated, and human settlements moved toward river systems, such as the Nile.
Modern Day
The Sahara Desert
The Sahara is now the world's largest hot desert, covering roughly 9.2 million square kilometres. Scientists continue studying past climate cycles to understand modern climate change.
square kilometres.⁴
Countries with Surprising Geographical Facts
Since political borders don't always align with geographical ones, certain countries can seem like geographical phenomena. Location, time, and borders can all ignore geographical rules and here are a couple of facts that show precisely what we mean.
The Country with the Most Time Zones
While Russia and Canada are the two biggest countries in the world in terms of area and east-to-west width. However, neither of these countries has the most time zones, nor is either the westernmost or the easternmost. The record for the most time zones actually goes to France. The country has 12 time zones, primarily due to its overseas territories, with regions in the Caribbean, South America, the Pacific Ocean, and the Indian Ocean all operating on different time zones.
time zones.
This is because these territories are considered part of France. While these areas were once colonies, modern France considers them part of the country, which also means they're classified as part of the European Union. They mightn't be geographically attached to mainland France in Europe. Still, the political reality means that the time in "France" could be one of 12 possible answers.
The Nation That Is Both the Westernmost and Easternmost
When it comes to the easternmost and westernmost countries, the United States makes this claim. Alaska's Aleutian Islands cross the 180° meridian (the International Date Line in geography terms). This means that some parts of the islands lie west of the line, and some east.
Human Impact on Geography
While some of the most impressive geographical facts showcase just how powerful geography can be. However, humans can (and do) impact the planet, which is why we study their impact as one of the five themes of geography. Here are a couple of interesting facts that combine geography and human activity. Though, as we know, many of these pale in comparison to the power of nature.
Cities That Are Sinking
Many cities around the world gradually sink as they expand. Mexico City is one of the best examples. The city was built on top of an ancient lake system, with the ground beneath it containing water-filled clay sediments. Heavy groundwater extraction is causing these sediments to compress, leading to land subsidence.¹
per year.¹
As water is removed from underground aquifers, the land above it sinks. This can damage buildings, roads, and infrastructure. It also increases flood risks during heavy rainfall. Scientists are studying this phenomenon to show how urban expansion and resource use reshape physical geography, creating long-term environmental concerns.
Islands Created by Humans
In addition to shaping landscapes, humans can even create them. A famous example of land creation is the artificial island of Palm Jumeirah in Dubai.⁵ These islands expanded coastline access, supported tourism, and created luxury residential areas.
cubic metres of sand were used.⁷
Using millions of tonnes of sand and rock, engineers constructed these islands. They're designed to withstand ocean currents and erosion. A remarkable example of engineering, they're also criticised for their environmental impact, particularly on the marine ecosystems that were there before they were built.
Fun and Quirky Geography Facts
Not every geographical fact has to be a downer. There are sometimes quirky and fun examples that are silly and tricky to classify as a type of geography. Our planet is beautiful, and sometimes some weird things can happen.
The Lake Within an Island on a Lake Within an Island
Taal Lake in the Philippines is like a set of nesting dolls. Within Taal Lake, there's Volcano Island. On Volcano Island, there's another lake. Within that lake, you'll find Vulcan Point, a small island. The result: an island within a lake on an island within a lake. What?
The Country with the Most Wild Bears
With vast forests, mountain ranges, and remote wilderness areas, Russia offers plenty of ideal habitats for bear species like brown bears and Asian black bears. With a massive land area and varied climate zones, you'll find wildlife populations that are difficult to find elsewhere on the planet.
wild bears in Russia
References
- American Geophysical Union. “The Looming Crisis of Sinking Ground in Mexico City.” EOS, https://eos.org/research-spotlights/the-looming-crisis-of-sinking-ground-in-mexico-city
- Encyclopaedia Britannica. “Challenger Deep.” Britannica, https://www.britannica.com/place/Challenger-Deep
- Encyclopaedia Britannica. “Mauna Kea.” Britannica, https://www.britannica.com/place/Mauna-Kea
- Encyclopaedia Britannica. “Mariana Trench.” Britannica, https://www.britannica.com/place/Mariana-Trench
- Encyclopaedia Britannica. “Palm Jumeirah.” Britannica, https://www.britannica.com/topic/Palm- Jumeirah
- Encyclopaedia Britannica. “Pororoca.” Britannica, https://www.britannica.com/science/pororoca
- Geology.com. “Artificial Islands of Dubai.” Geology.com, https://geology.com/satellite/artificial-islands-of-dubai/
- Guinness World Records. “Tallest Mountain.” Guinness World Records, https://www.guinnessworldrecords.com/world-records/tallest-mountain
- National Geographic Society. “Tidal Bore.” National Geographic Education, https://education.nationalgeographic.org/resource/tidal-bore/
- National Oceanic and Atmospheric Administration. “How Deep Is the Ocean?” NOAA Ocean Service, https://oceanservice.noaa.gov/facts/oceandepth.html
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