Looking for Hy-Brasil reference.

I could have sworn I saw a reference for Hy-Brasil in an ArM 5E supplement somewhere...

Am I crazy? Can anyone help a fella out here? Where was Hy-Brasil discussed or even mentioned? (in my mind's eye, I see it on the left hand page, lower part of one of the columns.) Damned if I can find it now.

I don't need other sources, that's already covered, but I don't want to retread ground that's been documented in canon material.

Thanks, much appreciated!