There are three heavens.
The first heaven is the atmosphere of our planet (Genesis 1:1: In the beginning God created the heaven and the earth).
The second heaven is Space, where the sun, moon, and stars are.
The third heaven has two sections. The lower section of the third heaven is the Region of the Blessed.
The upper section of the third heaven has two parts. The first is the Region of Angels. The second is God’s Throne (2 Corinthians 12:2-4: I knew a man in Christ above fourteen years ago, (whether in the body, I cannot tell; or whether out of the body, I cannot tell: God knoweth;) such an one caught up to the third heaven. And I knew such a man, (whether in the body, or out of the body, I cannot tell: God knoweth;) How that he was caught up into paradise, and heard unspeakable words, which it is not lawful for a man to utter).