蔚為大觀 [－为－观]

Jyutping wai3 wai4 daai6 gun1
Pinyin wèi wéi dà guān

Definitions (CC-CEDICT)
  1. to afford a magnificent sight (idiom)
  2. enchanting
Definitions (Wiktionary)
  1. phrase, idiomatic
    to present a magnificent spectacle