What Is the Largest Crater on Earth?

If you’re picturing a giant bowl carved into the landscape, the real answer might surprise you. The largest crater on Earth isn’t a dramatic hole you can peer into at all. The largest confirmed impact crater on Earth is the Vredefort crater in South Africa, a roughly 300-kilometer (190-mile) scar left by an asteroid about two billion years ago. Today it’s so old and eroded that you could drive across it without realizing it’s there. Here’s the full story of Earth’s biggest craters, why they’re so hard to see, and the one impact site you can still visit in pristine condition.

The Largest Crater on Earth: Vredefort

The Vredefort impact structure, in South Africa’s Free State province, holds the record as the largest verified impact crater on the planet. When it formed around 2.02 billion years ago, the original crater is estimated to have measured between 160 and 300 kilometers (100 to 190 miles) across, the result of an asteroid thought to be 10 to 15 kilometers wide slamming into the early Earth. That makes it both one of the largest and one of the oldest impact sites ever confirmed.

Two billion years of erosion and tectonic activity have worn the crater away almost completely. What remains is the Vredefort Dome, a ring of hills marking the central uplift that rebounded after the impact, recognized as a UNESCO World Heritage Site in 2005. The town of Vredefort sits near its center, and several communities now occupy land that was once ground zero for one of the most violent events in Earth’s history.

Why “Largest” Is Complicated

Measuring ancient craters is tricky. Scientists distinguish between the original crater, which may have spanned hundreds of kilometers, and the impact structure that survives today after erosion strips away the rim and tectonic forces deform what’s left. For very old craters like Vredefort, only the deep roots of the structure remain, so size estimates are careful reconstructions rather than direct measurements.

This is also why Earth has so few visible giant craters compared to the Moon or Mars. Our planet is geologically alive. Wind, water, plate tectonics, and volcanism constantly recycle the surface, erasing impact scars over millions of years. The Moon, with no atmosphere or active geology, preserves craters billions of years old in crisp detail, while Earth quietly buries or destroys its own.

There are also tantalizing candidates that could be even bigger, if they turn out to be real. The proposed Wilkes Land crater beneath the ice of Antarctica may span as much as 500 kilometers, which would dwarf Vredefort, but it has never been confirmed as an impact structure. Until scientists gather definitive evidence, Vredefort keeps the official title of the largest verified crater on Earth.

Other Giant Impact Craters

Vredefort may be the biggest, but it has company among the planetary heavyweights:

• Chicxulub (Mexico). About 180 kilometers (110 miles) wide and 66 million years old, Chicxulub is the famous crater linked to the extinction of the dinosaurs. Buried beneath the Yucatán Peninsula, it is the largest mostly intact impact crater on Earth, even though you cannot see it at the surface.
• Sudbury Basin (Canada). Roughly 130 kilometers across and 1.85 billion years old, this Ontario crater has been deformed into an oval over time. The impact concentrated rich nickel and copper deposits, making it one of the most valuable mining regions in the world.
• Manicouagan and Popigai. Each around 100 kilometers wide, these craters in Canada and Russia are striking from above. Manicouagan’s ring-shaped reservoir, the “Eye of Quebec,” is easily visible from space.

What About Volcanic Craters?

It’s worth noting that not every “crater” is an impact crater. Volcanic craters and calderas form when a volcano erupts and collapses, not when something strikes from space. Some of these are enormous in their own right, such as the Yellowstone Caldera or Indonesia’s Toba. When people ask about the largest crater on Earth, though, they almost always mean impact craters, which is where Vredefort reigns.

The Giants Are Invisible. The Best-Preserved Crater You Can Actually Visit Is Not.

Here’s the irony of Earth’s largest craters: the biggest ones are eroded, buried, or so faint you would never know you were standing in one. To actually see a textbook impact crater, you need a young one, and the finest example on the planet sits in northern Arizona.

Meteor Crater, also known as Barringer Crater, is just three-quarters of a mile across and about 550 feet deep, a fraction of the size of the giants above. But because it formed only around 50,000 years ago, when a 150-foot iron-nickel meteorite struck the desert at tremendous speed, it remains the best-preserved impact crater on Earth. Stand on its rim and you see exactly what a meteorite impact looks like: a clean, bowl-shaped cavity with an upturned rim, almost unchanged since the day it formed.

That combination of accessibility and preservation is what makes Meteor Crater so special. The world’s largest craters tell the story of planet-altering catastrophe, but most can only be appreciated from satellite images or geology textbooks. Meteor Crater lets you walk right up to one and feel the scale of a cosmic collision for yourself.

See an Impact Crater in Person

You may never visit Vredefort or peer into Chicxulub, but you can experience the raw power of a meteorite impact at Meteor Crater. With guided rim tours, sweeping overlooks, and a hands-on space museum, it brings the science of Earth’s craters to life. Plan your visit to Meteor Crater and stand at the edge of the best-preserved impact site on the planet.