Wat Arun Ratchawararam Ratchawaramahawihan or Wat Arun is a Buddhist temple (wat) in the Bangkok Yai district of Bangkok, Thailand. It is situated on Thonburi on the west bank of the Chao Phraya River. The temple derives its name from the Hindu god Aruṇa, often personified as the radiations of the rising sun. Wat Arun is among the best known of Thailand's landmarks. Although the temple has existed since at least the 17th century, its distinctive prang (spire) was built in the early 19th century during the reigns of Rama II and Rama III.