These are found in the moat of Katta. If you fall in, the only way out is to touch the underwater tapestry just like in the Caster building. It will port you to the area outside the bank.
lol fell in today and i didnt click tapesry under water but did see it, thanks for tip. However i could climb out at the ends of moat where track around water begins at both spots, just thought i would sayso, thanks .