普陀山 is formed by combining the characters 普 and 陀, which together serve as a phonetic transliteration of the Sanskrit "Potala", a term associated with a Buddhist sacred site, with the character 山, which denotes "mountain", thereby specifying it as a geographical feature.
Word Definition - 普陀山
pǔ tuó shānMt Potala at Zhoushan 舟山市 in Zhejiang, one of the Four Sacred Mountains and Bodhimanda of Guanyin 觀音|观音 (Avalokiteśvara)