Two areas in the game are referred to as the “Ruins”. The first is the area where Tidus arrives at when Sin first abducts him (this area), and the second is the Zanarkand Ruins.

The Ruins are located just outside Baaj Temple, although you can’t reach this area until later. You also can’t return to this Ruins area after you have passed through.

The Ruins are the second area of the game that you visit during a regular playthrough of the story. Check out the full walkthrough for more information:

There is a side quest in this area, but it is technically located in an area that you can’t reach from the Ruins. Still, you can use the following link to find out more information: