Four people — two students and two of the boat's crew — were rescued following the accident on Thursday night on the Mekong River southeast of Phnom Penh, police said.
The body of a 14-year-old boy, who had been missing, was found on Saturday morning, Major General Chhoeun Sochet, chief of the Kandal provincial police, said on his Facebook page.
The students, who were between 12 and 14 years old, were returning from an English class. They lived on an island in the river and used the ferry for transport almost every day in the rainy season, as did others from their village.
During the dry season, the river sometimes has little or no water and can be traversed by foot.
The boat was overloaded and lacked life jackets, the police chief said.
The accident occurred near the Neak Loeung bridge over the Mekong, which at that point separates Kandal province on the western shore from Prey Veng on the east. The bridge is part of Route 1, a major road connecting the capital, Phnom Penh, to Ho Chi Minh City in neighbouring Vietnam.
The police chief in Kandal's Leuk Daek district, Am Thou, said the accident occurred as the boat was approaching the shore. It took on water in the bow, and the students were instructed to move to seats in the middle or stern of the boat.
However, as they walked back, the boat became unbalanced and turned over.
King Norodom Sihamoni on his royal Facebook page offered condolences and prayers for the families of the victims. Prime Minister Hun Sen also gave condolences on the Telegram messaging platform.
"May I urge all the people, especially the people who live along the river, to pay the highest care during this flooding period," he said, referring to the recent heavy rains that possibly contributed to the accident.
Police chief Am Thou said the boat's two operators had been taken to hospital after the accident and would face legal action. He did not say what charges they would face.
The World Health Organisation said last year that according to assessments in 2019, more than 144,000 drowning deaths occurred in the Asia Pacific region, 61 per cent of the global total.
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