Armed with colourful oars, rowers pack into long boats in western Indonesia, paddling furiously in front of race crowds swelled by the viral success of a young boy famous for his dancing at the front of the traditional vessels.

The annual Pacu Jalur race on Sumatra island culminates on Sunday, with officials estimating as many as 100,000 more spectators this year because of 11-year-old Rayyan Arkan Dikha's dance moves on the fast-moving boats.

"I came to watch Pacu Jalur because I wanted to film and show the festival to the world," Australian tourist Duncan McNaught told AFP.

"I think the guys who row are crazy. They're awesome. I'm just looking forward to it."

A 20-second clip of Rayyan dancing on the boat has racked up millions of views on social media.

Sports stars including Formul

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