This question already has an answer here:
- Adjective + とする 1 answer
For full context: https://www3.nhk.or.jp/news/html/20180125/k10011302761000.html
The sentence in question: 高さが１３３メートルある「那智の滝」は、那智勝浦町にある熊野那智大社のご神体とされています。
My attempt at translation: "Concerning the nachifalls with a height of 133meters, they are made (together) with "Kumano Nachi Taisha" which is Nachikatsuura."
Obviously, the way I interpreted と here doesnt make much sense. But I simply have no idea what it is supposed to do there.