Peleg

Two sons were born to Eber; the name of the one was Peleg, for in his days the earth was divided; and his brother’s name was Joktan. (Genesis 10:25)

For the earth to be divided, it had to be unified.

Then God said, “Let the waters below the heavens be gathered into one place, and let the dry land appear”; and it was so. God called the dry land earth, and the gathering of the waters He called seas; and God saw that it was good. (Genesis 1:9-10)

Here and in the Hebrew, dry land is singular not plural; meaning one dry land appear. It possibly would have been divided during the flood when it says,

“on the same day all the fountains of the deep burst open” (Genesis 7:11)

1 Corinthians 15:46 says,

However, the spiritual is not first, but the natural; then the spiritual.

So, if the natural dry land was divided first, what was spiritually divided after?

References

Genesis 10:25

Genesis 1:9-10

Genesis 7:11

1 Corinthians 15:46

Genesis 11:1 – Now the whole earth used the same language and the same words.