Wan Ok Phansa (, ; literally "day of going out of Vassa", ออก in Thai meaning exit or leave) is the last day of the Thai-Lao observance of Vassa. It occurs in October, three lunar months after the beginning of Vassa, known as Wan Khao Phansa (). The day is celebrated in Isan by illuminated boat processions ( lai ruea fai, lai huea fai), notably in Nakhon Phanom Province on the Mekong and in Ubon Ratchathani on the Mun River. The main ceremonies feature boats of 8–10 metres in length, formerly made of banana wood or bamboo but now sometimes of other materials. The boats are filled with offerings such as khao tom (glutinous rice sweets wrapped in banana leaves) and decorated on the outside with flowers, candles and lamps. The boats are launched in the evening. Additionally, some celebrants individually launch their own, smaller, vessels. Boat races also take place around this time in many places throughout the country as a way to please the Nāga spirits. Along the Mekong River, people launch little hot air balloons, acting as a lanterns, around the night of Wan Ok Phansa. Launching the boats (or the lanterns) symbolizes your wishes but also getting rid of unnecessary negative feelings. Etymology "Wan" () means "day", "Ok" () means "to exit; to leave", and Phansa () is the Thai word for Vassa. Dates for Wan Ok Phansa See also Asalha Puja Kathina Pavarana Uposatha Ubon Ratchathani Candle Festival Tak Bat Devo Chak Phra Festival of Floral Offerings Thadingyut Festival, its equivalent in Myanmar Tazaungdaing Festival References Buddhist holidays October observances Observances set by the Thai lunar calendar Buddhist festivals in Thailand Boat festivals Observances held on the full moon Buddhist festivals in Myanmar