Xiyue 8. According to Sanya Duty Free City's entry information, Xiyue 8 is a restaurant located in the Sanya Duty Free Zone, which is Michelin certified with two Michelin stars. Sanya City, a prefecture-level city in Hainan Province, known as Yazhou for short, or Yazhou in ancient times, or Deer City, is located at the southernmost tip of Hainan Island. It is located at the southern tip of Hainan Island.