There is no such thing as the "four corners of the Earth" in a literal sense. The Earth is a sphere, and it doesn't have defined corners.

However, the phrase "four corners of the Earth" is a common idiom that means:

* Everywhere: It implies going to all the different places on Earth.

* The extremes: It can also suggest going to the most distant or remote locations.

There are some places that people sometimes jokingly refer to as "four corners," like:

* The Four Corners Monument: This is a point where the states of Utah, Colorado, Arizona, and New Mexico meet in the United States. It's a popular tourist spot.

* The Four Corners of Ireland: This is a phrase that refers to the four provinces of Ireland (Connacht, Leinster, Munster, and Ulster).

So, while there are no literal "four corners of the Earth," the phrase has a meaning and is often used in literature and everyday language.