Water Festival

Bon Om Touk — the Water Festival — is the single biggest gathering in the Cambodian year. For three days each November, several million people pour into Phnom Penh to watch hundreds of long, narrow racing boats paddle their hearts out down the Tonle Sap. It is loud, bright, packed, glorious, and unlike anything else in Southeast Asia.

When is the Water Festival?

The festival is timed to the full moon of the Khmer month of Kadeuk — usually in mid-to-late November. The three official days end on the night of the full moon. Approximate dates:

• 2026: approx. November 23–25 (Mon–Wed)
• 2025: November 3–5
• 2024: November 14–16

Why on the river?

The festival celebrates a remarkable hydrological phenomenon: the reversal of the Tonle Sap river. For most of the year the Tonle Sap flows from its great inland lake down to the Mekong. But during the rainy season the Mekong rises so high that it pushes water back into the Tonle Sap, forcing the river to flow backwards into the lake — which then expands to four times its dry-season size, becoming one of the world's most productive freshwater fisheries.

By November the rains have stopped and the river reverses again — flowing back out toward the sea. Bon Om Touk marks that moment of reversal, the moment the lake shrinks and millions of fish are carried downstream. It is, in a literal sense, a festival of abundance.

The boat races

The signature event is the long boat races(pirogues). Each boat is hand-carved from a single tree trunk, painted with naga (serpent) eyes at the bow, and crewed by up to eighty paddlerswho chant in unison. Boats are usually owned by villages or pagodas and race for honor of their community.

Heats run all three days from late morning to sunset, two boats at a time, sprinting roughly two kilometres down the Tonle Sap past the Royal Palace and the riverside in central Phnom Penh. The Royal family attends, traditional music plays, and a million-plus crowd lines the riverside. The grand finals on Day 3 are the climax — the winning boat wins not just bragging rights but a year of fame for its village.

The moon ceremony & ambok

On the night of the full moon — usually Day 2 or Day 3 of the festival — Cambodian families perform Sampeas Preah Khe, the moon-paying-respect ceremony, around midnight. Offerings of bananas, fresh-pressed coconut water, and a flattened-rice preparation called ambok are laid out under the moonlight, then the family bows three times in the moon's direction. The moon is honored as a symbol of light, generosity, and the rabbit that — in Buddhist legend — sacrificed itself to feed a stranger.

Ambok is the festival's signature food — rice grains that have been roasted and then pounded flat, eaten mixed with grated coconut, ripe banana, and a sprinkle of palm sugar. The texture is somewhere between cereal and dried noodles; the taste is gentle, nutty, with the banana doing most of the work. It is sold in plastic bags at every street stall during the festival week.

Fireworks & illuminated floats

On the final night, the riverside lights up with two extras: a fireworks show over the Royal Palace and a parade of illuminated floats (loy pratip) — barges decorated like floating palaces with hand-drawn lanterns, gold leaf, and figures from Khmer legend. Each float represents a ministry or province; they drift slowly down the river past the cheering crowds. The combination of the floats, the moon, and the fireworks is the image most Cambodians associate with the festival.

The floats typically begin appearing after 7 pm, once darkness falls over the Tonle Sap. Construction starts weeks in advance — teams work through the night assembling steel frames aboard the barges and then layering thousands of coloured bulbs, traditional kravan flower motifs, and carved mythical creatures including naga serpents and garuda birds. The Ministry of Culture float is traditionally the most elaborate and draws the loudest crowd response as it passes the Royal Palace grandstand.

For the best view of both the floats and the fireworks, position yourself on Sisowath Quay between the Royal Palace and the Cambodiana Hotel by 6:30 pm. This stretch gives a direct sightline across the water with the Royal Palace spires as a backdrop. Bring a light jacket — the river breeze after sunset is surprisingly cool even in November — and expect the area to be packed shoulder-to-shoulder from around 7 pm onward.

For visitors — what to expect

• Book hotels months ahead. Phnom Penh fills up like no other time of year. Riverside hotels can be sold out three months in advance, and prices double. If you want to be near the action, book in September.
• Pickpocketing. The crowds are dense and most are perfectly safe, but pickpockets do work the riverside. Keep your phone in a front pocket, leave your passport at the hotel, carry only what you need for the day.
• Walk, do not drive. Central Phnom Penh closes to cars for most of the festival. Motorbike taxis and tuk-tuks can drop you a kilometre away and you walk the rest. Wear comfortable shoes.
• Best viewing. The race route runs roughly from the Cambodia-Japan Friendship Bridge down past the Royal Palace. Anywhere along Sisowath Quay gives you a view. The grandstand area opposite the Royal Palace fills earliest.
• Bring water & sun protection. The races happen in afternoon sun. Vendors sell cold water everywhere but bringing your own bottle saves you queuing.
• Try ambok. It's the one food you can't easily get the rest of the year. Look for stalls selling it from a clear plastic bag with banana and grated coconut on top.
• Be patient with crowds. A million-plus people compressed into central Phnom Penh is a logistical challenge. Sometimes you cannot get where you wanted to be — accept it, find a spot, enjoy what's in front of you.

A note on safety

In 2010, a tragic crowd crush on Koh Pich (Diamond Island) at the end of the Water Festival killed more than 350 people. Since then the authorities have significantly improved crowd management: dedicated entry and exit lanes, fewer bottleneck bridges, more police presence. The festival is broadly safe today, but if you find yourself in an extremely dense crowd that stops moving — turn around and exit calmly. Do not try to push through.