Lake · Turkey
Lake İznik
İznik Gölü
Lake near İznik, Turkey
- Area
- 300km²
- Max depth
- 80m
- Average depth
- 19m
- Elevation
- 83m a.s.l.
- Shoreline
- 85km
- Volume
- 5.8km³
Lake İznik is a lake in Turkey. It covers 300 km². On average it is 19 m deep, and 80 m at its deepest point. Its surface lies 83 m above sea level.
Plan your visit
Stay, sail and get there
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The water
How warm is Lake İznik?
The water is warmest in August, around 26 °C at the surface, and coldest in February, around 8 °C. The surface averages 20 °C or more from June to September: comfortable for most swimmers.
It does not normally freeze in winter.
On the shore, afternoons reach 30 °C on average in August and 8 °C in January. The driest month is July (19 mm of rain), the wettest December (86 mm).
Average surface temperature measured by the Landsat 8 satellite between 2013 and 2021 at the point furthest from the shore (177 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 | 9 | 10 | 8 | 1 | 81 | 12 | 2.7 | 11 |
| February | 8 | 9 | 10 | 1 | 67 | 11 | 3.5 | 12 |
| March | 10 | 12 | 13 | 3 | 58 | 10 | 5.0 | 11 |
| April | 14 | 16 | 17 | 7 | 48 | 9 | 6.9 | 10 |
| May | 18 | 20 | 22 | 12 | 42 | 8 | 8.7 | 9 |
| June | 23 | 24 | 26 | 16 | 44 | 8 | 10.6 | 9 |
| July | 26 | 26 | 30 | 18 | 19 | 4 | 11.6 | 11 |
| August | 26 | 26 | 30 | 18 | 22 | 4 | 10.4 | 11 |
| September | 24 | 25 | 26 | 15 | 50 | 6 | 7.9 | 10 |
| October | 20 | 22 | 20 | 11 | 68 | 9 | 5.5 | 10 |
| November | 15 | 17 | 15 | 6 | 59 | 9 | 4.4 | 10 |
| December | 11 | 13 | 10 | 2 | 86 | 13 | 2.8 | 10 |
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 13 years before flowing out.
- Its catchment drains 1,254 km² of land.
- About 14 m³ of water flow out every second, on average.
Around the shore
What's around Lake İznik
Counted within 1.5 km of the shoreline in OpenStreetMap, the map anyone can edit.
- 2beaches and swimming spots
- 3campsites
Orhan Gazi Göl İskelesi, Free camp site
- —boat hire and water-sport clubs
- —marinas and slipways
- —ferry piers
- 1viewpoints
- 14hotels, B&Bs and chalets
Istanbul Otel, Cem Otel, Askania Otel, Gölyaka Stone Garden Otel, Aydın Hotel and 9 more
- —fishing spots
- 9restaurants and cafés
Towns on the shore
- İznik22,230 people
- Boyalıca2,227 people
- Çakırlı2,071 people
- Narlıca2,033 people
- Sölöz1,785 people
- Çakırca1,256 people
- Göllüce1,063 people
Nearest airport with scheduled flights: Bursa Yenişehir Airport (YEI), 21 km in a straight line.
Car hire at SAW airport (Pendik, Istanbul)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 | 7.8 | 9.7 | 12.9 | 17.2 | 22.1 | 26.4 | 29.6 | 29.7 | 25.5 | 19.9 | 14.8 | 9.5 |
| 2020 | −0.3 | +1.1 | +0.7 | −0.9 | +0.2 | −0.6 | −0.3 | +0.7 | +2.5 | +3.6 | −1.0 | +3.2 |
| 2021 | +2.1 | +0.6 | −2.9 | −0.9 | +1.1 | −2.0 | +0.3 | +1.2 | −1.6 | −1.2 | +1.7 | +0.9 |
| 2022 | −1.1 | +0.5 | −5.4 | +0.8 | +0.4 | −0.7 | −1.3 | +0.1 | +0.7 | −0.1 | +1.8 | +3.6 |
| 2023 | +4.0 | −0.4 | +0.2 | −0.8 | −2.8 | −1.3 | +2.0 | +2.6 | +1.4 | +2.3 | +2.6 | +3.6 |
| 2024 | +1.5 | +3.0 | +1.8 | +3.2 | −1.6 | +3.8 | +1.5 | +1.2 | +1.4 | +0.9 | −0.6 | +1.9 |
| 2025 | +3.8 | −3.0 | +3.3 | −1.5 | +0.5 | +2.3 | +3.7 | +0.7 | +0.2 | −0.1 | +3.5 | +1.1 |
+1 warmer than usual −1 cooler than usual
About 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 (Q192369) · 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.
