Genesis:
1:6 And God said, Let there be a firmament in the midst of the waters, and let it divide the waters from the waters.

In the vast universe of creation I believe at the beginning of this world an extremely small part of this water (in the midst) was separated by the newly created firmament. The water below being spherical and also the water above. It is commonly believed this water that was separated above had become like a canopy immediately above the atmosphere of Earth but I disagree. Almost all of the water is above in which the Sun, Moon, planets, stars, etc. where created using this water (Sun operates in hydrogen fusion/fission right?). The boundary beyond imagination and the universe outer boundary meet is where I believe this super vast water lies; covering the universe.