Naga Fireballs
On Wan Ok Phansa, the October full moon that ends Buddhist Lent, crowds on the Mekong watch reddish lights rise silently from the river, credited locally to the serpent deity Phaya Nak. A Thai television investigation in the early 2000s reported tracer ammunition fired from the Laotian side, a finding Thai officials disputed.
Field Guide Entry
For generations, communities along a roughly 150-mile stretch of the Mekong River centered on Phon Phisai, in Thailand's Nong Khai Province, have reported reddish balls of light rising silently out of the river and floating up a few hundred meters before vanishing without sound, heat, or smoke. The fireballs are most reliably reported once a year, on the night of Wan Ok Phansa, the full moon marking the end of Buddhist Lent in October, timing that fits neatly with local belief that they are fired by Phaya Nak, a giant serpent deity said to live in the river, celebrating the Buddha's return from his retreat in the heavens.
The festival now draws tens of thousands of visitors to riverside towns each year, many of whom report seeing dozens to hundreds of fireballs over the course of a night, rising from the water on both the Thai and Laotian sides of the river. The display's reliability around a specific lunar date, combined with the sheer number of simultaneous witnesses now filming with modern phones, is often cited by believers as evidence against simple mass misperception.
The most widely cited scientific theory holds that the fireballs are combusting pockets of phosphine and methane gas, generated by decomposing organic matter in the riverbed and released by seasonal pressure and temperature changes. Critics of that theory note such gases are not reliably self-igniting and that the lights' rise-and-vanish pattern doesn't fully match how gas combustion typically behaves. A Thai television investigation in the early 2000s reported finding tracer ammunition fired from the Laotian side of the river to manufacture some sightings, which Thai officials and many locals strongly disputed, leaving the river's actual mechanism, gas, hoax, or otherwise, formally unresolved even as the festival continues to grow.
Visiting Information
Best viewed on the night of Wan Ok Phansa each October, when riverside towns fill with vendors and viewing crowds for the annual Naga Fireball Festival. Lan Naka Beuk Fah, marked by a large golden naga statue on the riverbank, is one of the most popular public viewing points.
Field Gallery
No approved field photos yet. You could be first.
Community Notes
No community notes yet.
Explore More Mysteries
Kelly-Hopkinsville Encounter
On the night of August 21, 1955, the Sutton and Taylor families near Kelly said small, silver-eyed creatures kept appearing at their farmhouse windows and on the roof, and they fired on them for roughly 4 hours. Responding officers found bullet holes and shell casings but no creatures or footprints.
Loring Air Force Base Weapons Storage Area
On the evening of October 27, 1975, by one account, a security policeman guarding the nuclear weapons storage area at Loring Air Force Base watched an aircraft with a red light and a white strobe cross the northern perimeter at about 300 feet. It came back the next night. A memo from the National Military Command Center recorded an unidentified helicopter "landing briefly in proximity to a weapons storage area," and the Air Force never identified it.
Alleged UFO Skip Site
The Bureau of Land Management built a parking lot and a mile of walking to a patch of public land near Corona it officially calls the place where some people believe a craft came down in July 1947. The ranch where the debris was found is a separate property, private, and closed.
Brown Mountain Lights
In 1922, the U.S. Geological Survey sent George R. Mansfield to Brown Mountain with a surveying telescope. Over about two weeks he took bearings on every light that appeared and plotted them against rail lines, roads, and homesteads. He attributed 47 percent to automobile headlights and 33 percent to locomotives.