Reservoir · Laos
Angkep Nam Ngum
Reservoir in Laos
- Area
- 437km²
- Average depth
- 16m
- Elevation
- 208m a.s.l.
- Shoreline
- 655km
- Volume
- 7.0km³
Angkep Nam Ngum is a reservoir in Laos. It covers 437 km². On average it is 16 m deep. Its surface lies 208 m above sea level.
Plan your visit
Stay, sail and get there
Some links above are affiliate links: if you book through them we may earn a commission, at no extra cost to you. It never changes what the data on this page says.
The water
How warm is Angkep Nam Ngum?
The water is warmest in September, around 29 °C at the surface, and coldest in January, around 24 °C. The surface averages 20 °C or more from January to December: comfortable for most swimmers.
It does not normally freeze in winter.
On the shore, afternoons reach 35 °C on average in April and 27 °C in December. The driest month is December (6 mm of rain), the wettest August (220 mm).
Average surface temperature measured by the Landsat 8 satellite between 2013 and 2021 at the point furthest from the shore (99 readings). Shallow bays and beaches are often warmer.
From above
The whole lake from space
Month by month
The year at the lake, month by month
Not a forecast: these are averages over many years. Water is the 2013–2021 average; air, rain, sun and wind are the 1991–2020 average.
Water: 2013–2021 averageClimate: 1991–2020 average
| Month | Water°C | Water high°C | Air high°C | Air low°C | Rainmm | Rainy daysdays | Sunh/day | Windkm/h |
|---|---|---|---|---|---|---|---|---|
| January | 24 | 24 | 28 | 15 | 7 | 2 | 7.2 | 7 |
| February | 24 | 25 | 31 | 18 | 9 | 2 | 7.3 | 8 |
| March | 26 | 26 | 33 | 21 | 30 | 6 | 6.4 | 8 |
| April | 27 | 28 | 35 | 24 | 51 | 11 | 7.0 | 7 |
| May | 28 | 28 | 33 | 24 | 136 | 21 | 6.1 | 7 |
| June | 28 | 28 | 32 | 24 | 146 | 22 | 5.0 | 7 |
| July | 28 | 28 | 31 | 24 | 188 | 25 | 4.2 | 7 |
| August | 28 | 29 | 30 | 23 | 220 | 26 | 4.1 | 6 |
| September | 29 | 29 | 30 | 23 | 163 | 21 | 5.2 | 6 |
| October | 28 | 29 | 30 | 21 | 64 | 11 | 6.3 | 6 |
| November | 27 | 28 | 30 | 18 | 14 | 3 | 7.5 | 6 |
| December | 25 | 26 | 27 | 15 | 6 | 1 | 7.3 | 6 |
Water: LakeTEMP (Landsat 8, 2013–2021). Air, rain, sun and wind: NASA POWER, 1991–2020 averages. A rainy day has at least 1 mm of rain. Sunshine hours are derived from measured solar radiation.
Size & depth
How big, how deep
- On average, water stays in the lake for about 9 months before flowing out.
- Its catchment drains 8,308 km² of land.
- About 299 m³ of water flow out every second, on average.
- Its shoreline is 8.8 times longer than a circle of the same area: plenty of bays and inlets.
Around the shore
What's around Angkep Nam Ngum
Counted within 1.5 km of the shoreline in OpenStreetMap, the map anyone can edit.
- 1beaches and swimming spots
- —campsites
- —boat hire and water-sport clubs
- 1marinas and slipways
- 1ferry piers
- 2viewpoints
- 18hotels, B&Bs and chalets
Khamhuang Guest House & Restaurant, Fisherman Restaurant and Guesthouse, Long Ngum Resort, Sanctuary Nam Ngum Beach Resort, Sangdao Guesthouse and 13 more
- —fishing spots
- 22restaurants and cafés
Nearest airport with scheduled flights: Wattay International Airport (VTE), 68 km in a straight line.
Car hire at UTH airport (Udon Thani)Discover Cars · Affiliate linkOpenStreetMap is built by volunteers: when a number is low, it may just mean nobody has mapped it yet.
Recent years
How each month compared
Afternoon high on the shore. The first row is the reference, the 1991–2020 average in °C; the years below show the difference from it: warmer in orange, cooler in blue.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1991–2020 average | 27.5 | 30.6 | 33.4 | 35.1 | 33.4 | 31.7 | 30.6 | 29.9 | 30.5 | 30.5 | 29.5 | 27.1 |
| 2020 | +0.5 | −1.0 | −0.7 | −3.3 | +0.4 | −1.5 | −0.2 | −0.7 | −0.3 | −1.9 | −1.7 | −2.3 |
| 2021 | −3.5 | −2.4 | −1.6 | −3.6 | −0.8 | −1.4 | −0.7 | +0.2 | −0.4 | −1.4 | −2.0 | −2.5 |
| 2022 | −1.0 | −5.0 | −2.2 | −3.8 | −3.9 | −1.8 | −0.2 | −0.6 | −0.6 | −1.8 | −0.8 | −3.3 |
| 2023 | −2.9 | −1.2 | −1.6 | +1.0 | +2.4 | +0.2 | +1.6 | +0.4 | +0.2 | +0.5 | +1.2 | +2.8 |
| 2024 | +1.2 | +2.3 | +1.1 | +4.3 | +1.1 | −0.2 | −0.4 | +0.6 | +0.3 | +0.2 | +0.3 | +0.6 |
| 2025 | −0.3 | ±0.0 | +0.5 | +0.6 | +1.4 | +0.6 | −0.1 | +0.9 | −0.4 | −0.3 | −2.3 | +0.9 |
+1 warmer than usual −1 cooler than usual
ThailandAbout these numbers
| Outline, area, depth, volume | HydroLAKES v1.0 (Messager et al. 2016) · CC BY 4.0 |
|---|---|
| Water temperature and ice | LakeTEMP v1 (Korver et al. 2024), Landsat 8 2013–2021 · CC BY 4.0 |
| Air, rain, sun, wind | NASA POWER, 1991–2020 · public domain |
| Names and description | Wikidata (Q34876542) · CC0 |
| Around the shore | © OpenStreetMap contributors · ODbL |
| Images | EOX Sentinel-2 cloudless 2016 · CC BY 4.0; Wikimedia Commons |
Every figure is an average or a count from a public dataset. Licences and methods: data sources.
