Description
O'Sinlair is the waterfall destination also described as Ou Sean Lair or the seven-tier waterfall in Ka Laeng, Lumphat. Official tourism material describes a sequence of falls within a forested watercourse.
Plan the outing with a receiving host who knows the route. Old reports of difficult tracks and river crossings do not establish a fixed driving time or today’s vehicle requirements.
Place and locality context ↗How to Get There
Reach Banlung by intercity bus, minivan or car. From the Stung Treng side, the road connection runs east toward Banlung; waterfalls, Veun Sai and forest programmes are separate outings.
For O'Sinlair / Seven-Tier Waterfall, continue toward Ka Laeng, Lumphat. A car or motorbike covers the local road section; use the established approach for the final walk and keep a return vehicle for a countryside outing.
Road and transport context ↗Admission
Entry, parking and activities can be charged separately at recreation sites. A reliable current tariff is not published in the reviewed sources; keep a separate cash allowance for the visit rather than relying on an old quoted price.
Things to Do
Visit the cascade section approved by the local guide and enjoy the forest setting. Treat upstream or downstream extensions as separately agreed walks.
Place and locality context ↗What to Eat
Rice dishes, seasonal fruit and coffee are practical choices around Banlung. Take a packed lunch and water for a forest or river outing.
Where to Stay
Banlung is the main accommodation base for the volcanic lakes and nearby waterfalls. A Veun Sai or Virachey overnight is a separate community or trekking arrangement.
Best Time to Visit
Water flow is usually stronger during and after the rainy season, while the dry season can expose more rock. Visit in daylight and avoid the stream during heavy rain or a sudden rise in water level.
Before You Go
Do not cross a rising stream or enter water based on a dry-season video. A seven-tier name is not a guarantee that every level is open to visitors.
Videos
Watch visits and stories about this place. Older footage may show different access, facilities or river conditions.
O'Sinlair Waterfall, Ratanakiri
By kon KhmerOMC
Recorded visit matched to the place by its published title and locality. Recording date and present access are not established. Use the source link if the platform restricts embedded playback.
Open original ↗Players load when you choose a video. If playback is unavailable here, use “Open original”.
Location map
Site location: Mapped O'Sinlair seven-step waterfall feature
Shows the published site location; follow the signed visitor approach.
Location reference ↗Ka Laeng, Lumphat, Ratanakiri Province, Cambodia
Guide reviewed 25 October 2026. Prices and access can change.
