By diameter:
* Vredefort Crater, South Africa: 300 km (186 miles) in diameter. This is the largest confirmed impact crater on Earth. It's estimated to be about 2 billion years old.
* Sudbury Basin, Canada: 62 km (39 miles) in diameter.
* Chicxulub Crater, Mexico: 180 km (112 miles) in diameter. This is the crater that formed when the impact that killed the dinosaurs occurred.
By depth:
* Chicxulub Crater, Mexico: ~1.2 km (0.75 miles) deep. Note that it's significantly buried by sediment and rock.
By age:
* Vredefort Crater, South Africa: ~2 billion years old.
By impact energy:
* Chicxulub Crater, Mexico: This crater is estimated to have been formed by an asteroid with a diameter of 10-15 km (6-9 miles), releasing an estimated 19 million times the energy of the atomic bomb that destroyed Hiroshima.
It's important to note that:
* Many craters are buried or eroded: Many of the craters are either partially or completely buried by sediment or eroded over time, so the actual size is difficult to determine.
* The Earth's surface is constantly changing: Plate tectonics and erosion constantly change the Earth's surface, making it difficult to find and study very old craters.
If you are interested in a specific aspect of size, please clarify your question. For example, you could ask "What is the largest crater on Earth by diameter?" or "What is the deepest crater on Earth?".
