I guess that is up to interpretation. Sounds like the entire earth according to the below. It makes more sense to me that God destroyed the earth with the flood. The next judgement will be with fire.

Genesis 7:10-22 KJV

Specifically.... 10 And it came to pass after seven days, that the waters of the flood were upon the earth.

21- 24: 21 And all flesh died that moved upon the earth, both of fowl, and of cattle, and of beast, and of every creeping thing that creepeth upon the earth, and every man: 22 All in whose nostrils was the breath of life, of all that was in the dry land, died. 23 And every living substance was destroyed which was upon the face of the ground, both man, and cattle, and the creeping things, and the fowl of the heaven; and they were destroyed from the earth: and Noah only remained alive, and they that were with him in the ark. 24 And the waters prevailed upon the earth an hundred and fifty days.

I'm not arguing. Just posting what I know and think of God's word.

Take care fren. God bless you :)