2. Kiriwong villageLan Saka Khiriwong is a village in Nakhon Si Thammarat Province of Thailand. It is known as the best ozone area in Thailand. It is located in the Lan Saka district in Nakhon Si Thammarat. Kiriwong has been located in this area for over 200 years.formerly known as Bann Khun because it is located near the top of a hill in the mountains of Nakhon Si Thammarat. Later it was renamed as Baan Khiriwong according to the name of the Khiriwong temple which means House within the circle of the mountain From Wikipedia, the free encyclopedia.