Da River (SUP)
Also known as: Song Da, Black River
Ha Long Bay in the mountains - emerald water, forested karst islands; Ba Khan Bay, Ngoi Hoa Bay, Thung Nai; Muong/Dao villages
Is there water?
Whether there is a river here on your dates, and what kind of water it is.
Regulated reservoir; inflow controlled by Son La/Lai Chau upstream; Hoa Binh performs Red River flood control. Confirm.
Year-round lake; avoid typhoon/discharge May-Oct. Confirm.
Oct/Nov-Apr (dry, stable levels)
Subtropical - warm May-Sep, cooler Dec-Feb; exact temp -
NE Vietnam monsoon May-Oct; typhoon season Jun-Nov (peak Aug-Oct) brings inflow and discharge surges. Confirm.
Grade & who can come
A river changes grade with its level. These grades describe a normal flow - in flood the same run is harder, and often a different run entirely. Check the gauge before you commit.
Flatwater (lake)
SUP / flatwater kayak
Single group day or multi-day bay-hopping
Beginner to intermediate SUP/kayak; family-friendly
The run
None - open-water wind and chop; dam spillway discharge. Confirm.
Dam spillway/bottom-gate releases (opened multiple times in 2024) - heed downstream safety notices; boat traffic. Confirm.
Hoa Binh Reservoir (Ngoi Hoa / Ba Khan bays)
Growing SUP/kayak tourism; quieter than coastal spots
Access & shuttle
Standard tourism access for guided tours; no special permits noted; independent paddling subject to discharge conditions. Confirm.
Permits and operators change - confirm before booking.
Reservoir piers at Thung Nai, Ngoi Hoa Bay, Ba Khan (Son Thuy commune)
Good roads; van shuttle from Hanoi (~70 km, ~2.5 hr); support boats common
Shoreline homestays and glamping (Ba Khan); operator camps
SUP/kayak provided by operators; sun and heat protection; decent coverage near shore
Hoa Binh city hub; Hanoi-based operators
Hazards & exits
Hoa Binh Dam (1,920 MW, ~9.45 billion m3, Vietnam largest reservoir) impounds the lake; Son La and Lai Chau dams upstream; frequent wet-season spillway openings. Confirm.
Road and boat access throughout; main risk is dam discharge and wind
Guided SUP/kayak tours widely available; guide recommended
This profile is desk research, compiled from public sources - not a first-hand river run report. Coordinates are approximate.