Rivers of Thailand
THEN

Basin Mun

Siao River

ลำน้ำเสียว

A river in the Thung Kula Ronghai plain that flows into the Mun River.

Map of the Siao River
The dark line is this river; the mid-blue lines are its named tributaries.
View on the 3D map

Key facts

Length
about 220 kmMeasured along the river on this map; official figures can differ with the method used
Source
Maha Sarakham province
Flows into
Mun River, Si Sa Ket province
Basin
Mun
Provinces (3)
Maha Sarakham, Roi Et, Si Sa Ket

Siao River water level today

1 automatic gauging stations on this river, highest water relative to the bank first. As of 29 Sep 2026, 23:00

StationLocationLevel (m MSL)Of bank-fullStatusMeasured
บ้านดอนยางSuwannaphum District, Roi Et121.1573%High29 Sep 2026, 23:00

Data from the National Hydroinformatics Data Center (ThaiWater), HII, refreshed every 10 minutes

Frequently asked questions

Which provinces does the Siao River flow through?
The Siao River flows through 3 provinces: Maha Sarakham, Roi Et and Si Sa Ket.
How long is the Siao River?
The Siao River is about 220 km long, measured along the river on this map. Official figures can differ slightly with the method used.
Where does the Siao River come from?
The Siao River rises in Maha Sarakham province.
Which river does the Siao River flow into?
The Siao River flows into the Mun River in Si Sa Ket province.
What is the Siao River water level today?
Of 1 gauging stations, 0 are over the bank and 1 have high water. Data as of 29 Sep 2026, 23:00.
What is the Siao River called in Thai?
In Thai the Siao River is ลำน้ำเสียว.

Other rivers in the Mun basin

Mun RiverLam TakhongLam Phra PhloengLam Dom YaiLam Dom NoiHuai Thap ThanHuai SamranLam Se Bai