Surfing in Riau is unlike anywhere else in Indonesia. Instead of ocean reef breaks, the surf here centers on river-mouth waves on the eastern side of Sumatra, and the star attraction is Bono, the famous tidal bore that rolls up the Kampar River near Teluk Meranti. On a good push it becomes a rideable wall of whitewater that peels for kilometers upstream as the tide floods in.
Both known Riau surf spots sit around Teluk Meranti and the Teluk Tanah Terbakar stretch, and both are sand-bottomed river-mouth setups pitched at intermediate surfers. Because these are bore and river-mouth waves rather than open-coast breaks, everything revolves around the tide: high tide is when they come alive, since the incoming surge is what builds and drives the wave.
On the swell side, these breaks respond to energy from the southern quarter, roughly south through southwest, and hold a workable size window from about 1 ft (0.3 m) up to 3 m (10 ft). Southwest wind is the prevailing condition to plan around. A good bore day is powerful, but the long, forgiving face makes it approachable for confident intermediates rather than demanding the reef skills you would need on the more exposed Indonesian coasts.
If you are weighing where to surf, Bono and Teluk Meranti are the names to know. There is no reef-pass lineup here, so the draw is the novelty and sheer length of the ride rather than punchy barrels. Plan around the tidal calendar, with the biggest bores arriving on the strongest tides, keep an eye on the wind, and treat Riau as a bucket-list detour for something genuinely different rather than a classic Indonesian surf trip.
