Basin Nan
Nan River
แม่น้ำน่าน
Rises in the Luang Prabang Range in the north of Nan province. It flows through Nan, Uttaradit, Phitsanulok and Phichit, then joins the Ping River at Pak Nam Pho to form the Chao Phraya River. It is dammed by the Sirikit Dam in Uttaradit province.
Key facts
- Length
- about 845 kmMeasured along the river on this map; official figures can differ with the method used
- Source
- Nan province
- Flows into
- Chao Phraya River, Nakhon Sawan province
- Basin
- Nan
- Provinces (5)
- Nan, Uttaradit, Phitsanulok, Phichit, Nakhon Sawan
- Tributaries on the map
- Yom RiverKhek RiverKhwae Noi River (Phitsanulok)Pat RiverWa River
- Dams on the river
- Sirikit DamNaresuan Dam
Nan River water level today
24 automatic gauging stations on this river, highest water relative to the bank first. As of 15 Nov 2026, 07:40
| Station | Location | Level (m MSL) | Of bank-full | Status | Measured |
|---|---|---|---|---|---|
| วัดเกยไชยเหนือ | Chum Saeng District, Nakhon Sawan | 23.44 | 70% | Normal | 15 Nov 2026, 06:00 |
| บ้านราชช้างขวัญ | Mueang Phichit District, Phichit | 30.81 | 60% | Normal | 15 Nov 2026, 06:00 |
| Nan 7 | Taphan Hin District, Phichit | 28.89 | 58% | Normal | 15 Nov 2026, 07:40 |
| Nan 8 | Chum Saeng District, Nakhon Sawan | 22.86 | 57% | Normal | 15 Nov 2026, 07:40 |
| Nan 4 | Phichai District, Uttaradit | 47.90 | 54% | Normal | 15 Nov 2026, 07:40 |
| บ้านเด่นสำโรง | Tron District, Uttaradit | 50.10 | 46% | Normal | 15 Nov 2026, 06:00 |
| บ้านหาดสองแคว (N.60) | Tron District, Uttaradit | 49.99 | 45% | Normal | 15 Nov 2026, 07:00 |
| Nan 11 | Mueang Uttaradit District, Uttaradit | 53.44 | 45% | Normal | 15 Nov 2026, 07:40 |
| ต.ในเมือง | Mueang Uttaradit District, Uttaradit | 53.42 | 45% | Normal | 15 Nov 2026, 06:00 |
| ท้ายเขื่อนนเรศวร | Phrom Phiram District, Phitsanulok | 40.40 | 44% | Normal | 15 Nov 2026, 06:00 |
| สะพานสุพรรณกัลยา | Mueang Phitsanulok District, Phitsanulok | 37.07 | 43% | Normal | 15 Nov 2026, 06:00 |
| Wieng Sa | Wiang Sa District, Nan | 179.29 | 42% | Normal | 15 Nov 2026, 07:40 |
| Nan 3 | Phu Phiang District, Nan | 190.45 | 41% | Normal | 15 Nov 2026, 07:40 |
| Nan 12 | Mueang Phitsanulok District, Phitsanulok | 37.67 | 40% | Normal | 15 Nov 2026, 07:40 |
| หน้าสำนักงานป่าไม้ | Phu Phiang District, Nan | 192.79 | 38% | Normal | 15 Nov 2026, 06:00 |
| Nan 6 | Bang Krathum District, Phitsanulok | 32.73 | 34% | Normal | 15 Nov 2026, 07:40 |
| บ้านผาจุก | Mueang Uttaradit District, Uttaradit | 56.49 | 29% | Low | 15 Nov 2026, 07:00 |
| Yom-Nan4 | Mueang Phitsanulok District, Phitsanulok | 36.85 | 28% | Low | 15 Nov 2026, 07:40 |
| อ.เมืองน่าน (N.1) | Phu Phiang District, Nan | 192.85 | 27% | Low | 15 Nov 2026, 07:00 |
| Nan 1 | Tha Wang Pha District, Nan | 218.12 | 26% | Low | 15 Nov 2026, 07:40 |
| อ.เวียงสา (N.13A) น้ำน่าน | Wiang Sa District, Nan | 178.07 | 25% | Low | 15 Nov 2026, 07:00 |
| บ้านหาดไผ่ | Tha Pla District, Uttaradit | 70.81 | 20% | Low | 15 Nov 2026, 06:00 |
| Nan 2 | Phu Phiang District, Nan | 196.88 | 17% | Low | 15 Nov 2026, 07:40 |
| บ้านผาขวาง | Mueang Nan District, Nan | 212.45 | 17% | Low | 15 Nov 2026, 06:00 |
Data from the National Hydroinformatics Data Center (ThaiWater), HII, refreshed every 10 minutes
Frequently asked questions
- Which provinces does the Nan River flow through?
- The Nan River flows through 5 provinces: Nan, Uttaradit, Phitsanulok, Phichit and Nakhon Sawan.
- How long is the Nan River?
- The Nan River is about 845 km long, measured along the river on this map. Official figures can differ slightly with the method used.
- Where does the Nan River come from?
- The Nan River rises in Nan province.
- Which river does the Nan River flow into?
- The Nan River flows into the Chao Phraya River in Nakhon Sawan province.
- Which dams are on the Nan River?
- Dams on the Nan River on this map: Sirikit Dam and Naresuan Dam.
- What is the Nan River water level today?
- Of 24 gauging stations, 0 are over the bank and 0 have high water. Data as of 15 Nov 2026, 07:40.
- What is the Nan River called in Thai?
- In Thai the Nan River is แม่น้ำน่าน.