The Loy Kratong festival is a Thai festival held annually in November where people float krathong (small rafts made from banana leaves and decorated with flowers, candles, and incense) on rivers and canals to worship the river goddess and float away misfortune. It is celebrated on the full moon of the 12th lunar month. In Chiang Mai it is called Yee Peng where people float lanterns into the sky instead of krathong. In Tak people make krathong out of coconut shells threaded together called Loy Kratong Sai. The festival celebrates gratitude for water and forgiveness for pollution in the rivers while bringing good fortune for the coming year.