Bang Fai Phaya Nak, “Naga Fireballs,” is held in the northeastern province of Nong Khai which a great number of fireballs are usually seen in Phon Phisai district. This phenomenon takes place once a year at the end of the three-month Buddhist Lent, in October. The highlight of the festival is on Ok Phansa Day. At night, fireballs of various sizes burst from the bottom of the Mekong River, sprint above the water surface, and then move skyward before disappearing. The Naga Fireball Festival also include a bazaar, a food fair, a contest of floating and illuminated boats in worship of the Naga, long-boat races, and light and sound presentation.