Loi Krathong (Thai: ลอยกระทง, pronounced [lɔ̄ːj krā.tʰōŋ]) is a Siamese festival celebrated annually throughout the Kingdom of Thailand and in nearby countries with significant southwestern Tai cultures (Laos, Shan, Mon, Tanintharyi, Kelantan, Kedah and Xishuangbanna). The name could be translated as "to float a basket," and comes from the tradition of making krathong or buoyant, decorated baskets, which are then floated on a river.
Loi Krathong takes place on the evening of the full moon of the 12th month in the traditional Thai lunar calendar, thus the exact date of the festival changes every year. In the Western calendar this usually falls in the month of November. In Chang Mai, the festival lasts three days, and in 2018, the dates will be 21 - 23 November. In Thailand, the festival is known as "Loi Krathong" (ลอยกระทง). Outside Thailand, this festival is celebrated under different names, including Myanmar as the "Tazaungdaing festival", Sri Lanka as "Il Full Moon Poya" and Cambodia as "Bon Om Touk".