Wan AWk Phansa; literally “day of going out of Vassa”, 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 the Isan province by illuminated boat processions in Northeastern Thailand, notably in Nakhon Phanom Province on the Mekong and in Ubon Ratchathani city on the Mun River.