Talk:Siegward of Catarina/@comment-30293843-20170811043910/@comment-5264386-20170811233817

It's found directly outside the Cleansing Chapel bonfire in the Cathedral of the Deep. After you've warped to the bonfire, head out the main entrance, as if you were going to start the area. Look to the right-hand side of the entrance, where the lone Hollow that lights itself on fire is. You'll find the well right next to that enemy.

It took a while for me to find it as well!