Lake · Cambodia
Tonle Sap
Lake in Cambodia
- Area
- 2,416km²
- Max depth
- 2m
- Average depth
- 13m
- Elevation
- 4m a.s.l.
- Shoreline
- 404km
- Volume
- 30.6km³
Tonle Sap is a lake in Cambodia. It covers 2,416 km². On average it is 13 m deep, and 2 m at its deepest point. Its surface lies 4 m above sea level.
Plan your visit
Stay, sail and get there
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The water
How warm is Tonle Sap?
The water is warmest in June, around 29 °C at the surface, and coldest in January, around 26 °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 36 °C on average in March and 30 °C in September. The driest month is December (10 mm of rain), the wettest September (250 mm).
Average surface temperature measured by the Landsat 8 satellite between 2013 and 2021 at the point furthest from the shore (80 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 | 26 | 26 | 33 | 22 | 17 | 3 | 7.9 | 10 |
| February | 26 | 27 | 35 | 24 | 23 | 5 | 7.6 | 9 |
| March | 27 | 28 | 36 | 26 | 55 | 10 | 6.9 | 8 |
| April | 28 | 28 | 35 | 26 | 82 | 14 | 7.4 | 8 |
| May | 28 | 29 | 33 | 26 | 153 | 23 | 7.2 | 9 |
| June | 29 | 29 | 31 | 25 | 215 | 25 | 6.7 | 10 |
| July | 29 | 29 | 30 | 25 | 248 | 26 | 6.3 | 11 |
| August | 28 | 28 | 30 | 25 | 231 | 26 | 5.7 | 12 |
| September | 28 | 28 | 30 | 25 | 250 | 26 | 5.3 | 10 |
| October | 27 | 28 | 30 | 24 | 155 | 21 | 6.1 | 9 |
| November | 27 | 27 | 31 | 23 | 46 | 8 | 7.1 | 10 |
| December | 26 | 26 | 32 | 22 | 10 | 2 | 7.7 | 11 |
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 11 months before flowing out.
- Its catchment drains 54,970 km² of land.
- About 1,107 m³ of water flow out every second, on average.
Around the shore
What's around Tonle Sap
Counted within 1.5 km of the shoreline in OpenStreetMap, the map anyone can edit.
- —beaches and swimming spots
- —campsites
- —boat hire and water-sport clubs
- —marinas and slipways
- 1ferry piers
- 2viewpoints
Sunset Spot
- 1hotels, B&Bs and chalets
Vuth Khoan Guest House
- —fishing spots
- 4restaurants and cafés
Towns on the shore
- Neang Sav2,618 people
Nearest airport with scheduled flights: Siem Reap-Angkor International Airport (SAI), 48 km in a straight line.
OpenStreetMap 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 | 32.7 | 34.7 | 35.5 | 34.9 | 33.2 | 31.2 | 30.2 | 30.0 | 29.9 | 30.2 | 30.9 | 31.5 |
| 2020 | +2.3 | +0.4 | +1.3 | −0.9 | +1.1 | +0.1 | +0.4 | +0.5 | +0.3 | −1.5 | −1.3 | −2.1 |
| 2021 | −2.1 | −0.7 | +1.0 | −1.7 | −1.3 | −0.5 | −0.1 | +0.2 | −0.6 | −0.8 | −1.4 | −2.7 |
| 2022 | −0.2 | −1.7 | −1.9 | −1.4 | −1.5 | +0.2 | +0.2 | −0.3 | −0.9 | −0.7 | −0.7 | −1.5 |
| 2023 | −1.3 | +0.4 | +1.0 | +1.8 | +3.0 | +1.4 | +1.9 | +2.4 | +1.3 | +0.9 | +0.9 | +1.9 |
| 2024 | +2.2 | +2.3 | +1.9 | +5.6 | +2.3 | +1.7 | +1.5 | +2.6 | +1.1 | +0.5 | +1.9 | +1.6 |
| 2025 | +0.4 | +0.8 | ±0.0 | +0.9 | +2.3 | +1.3 | +2.0 | +1.3 | −0.1 | +0.6 | −0.8 | +1.6 |
+1 warmer than usual −1 cooler than usual
VietnamAbout 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 (Q199938) · 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.
