Krathong Sai is a form of float made by Thai people living in Thailand's northern province of Tak. It is used to pay homage to the 'Goddess of Water' in the River Ping. The prominent feature of Krathong Sai is that it is fashioned from an intact, polished half-coconut shell in which are placed tinder or threads made in the form of crow's foot placed in oil. Candles are also used. On Krathong Sai is made for each family member, who lights the candle before setting it afloat on the River Ping.