Corel Prison
The Corel Prison is located in the same spot on the map as Gold Saucer, as the prison serves as the base of the “Gold Saucer tree.” The prison lacks security or guards, for the most part, operating in a state of semi-lawlessness.

The story takes you through Corel Prison only once, and then you can no longer return to this location in the game. Check out the Corel Prison walkthrough section for details. You wind up in the Corel Prison after a man with a gun-arm (Dyne) goes on a rampage in Battle Square, and your party ends up taking the fall as the guilty person is assumed to have been Barret.

This visit occurs after you reach the Gold Saucer. When you escape from Corel Prison, you receive a Buggy from Ester, which you then use to transport your team either to Gongaga or Cosmo Canyon.
There is one shop that you can find in the pub-style building where you can purchase just a few basic items listed below:
The map below shows the location of the Corel Prison (and Gold Saucer) on the world map:
