Germany Raimond Spekking · CC BY-SA 4.0
The descent
The entrance, at 44 m.
The real relief above Neptune Grotto, measured on the Copernicus model every 30 m, and the cave going down at the same vertical scale.
The depth is the one published by those who explored it; the shape of the galleries is a sketch, not a survey. No depth has been published for this cave yet.
44m
Entrance altitude
from the 30 m relief model
10°C
Inside, all year
the yearly average outside, at the entrance
43m
Rock above
the highest point within 1.5 km
Inside and outside
10 °C inside, all year.
Deep inside, a cave keeps the average temperature of the year outside: about 10 °C here, in January and in August. In July the afternoon reaches 26 °C at the entrance, 16 °C warmer than inside: take a jacket.
- 2°-3°Jan
- 4°-3°Feb
- 8°-1°Mar
- 14°4°Apr
- 20°8°May
- 24°13°Jun
- 26°15°Jul
- 26°14°Aug
- 21°10°Sep
- 14°5°Oct
- 7°2°Nov
- 3°-1°Dec
Outside: afternoon and night averages for 1991–2020 (NASA POWER) brought to the altitude of the entrance. Inside: the yearly average, which deep parts of a cave keep. Near the entrance it follows the weather a little.
Sanssouci
Neptune Grotto is a cave in Germany. The entrance is at 44 m. It is part of a UNESCO World Heritage site.
Getting there.
- Wild cave: only with caving equipmentNo paths or lights inside. Go only with a caving club or a qualified guide.
- Potsdamnearest town · 1.7 km in a straight line
- Viewpointsnearest viewpoint · 0.6 km from the entrance
- Berlin Brandenburg Airport (BER)nearest airport with scheduled flights · 32 km in a straight lineCar hire at BER airport (Berlin)Discover Cars · sponsored link↗
Plan the visit
Guided tours, a bed nearby, a car.
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.
From above.
The ground above the cave, with the relief shaded, the line of the section and what people have mapped around the entrance.
N
1.5 km
Sentinel-2 cloudless 2016 (EOX, CC BY 4.0), 6.0 × 6.0 km, north up. The line is the section above. Points © OpenStreetMap contributors.
Around the entrance.
- 34viewpoints within 3 kmGeneralseichen, Dachterrasse, Kaiser-Friedrich-Blick and 31 more
- 22marked hiking routes within 3 kmEuropäischer Fernwanderweg E10, Deutschland, Brandenburg, Fontaneweg F4, Große Wildpark-Route and 19 more
- 4climbing crags within 3 kmBoulder-Wand and 3 more
- 1named waterfalls within 4 kmWilhelm Wasserfall
- 438car parks within 2 km
- 181information boards and visitor centres within 3 km
- 148bus stops within 2 km
- 11campsites within 8 kmNatur- und Kulturcamp Treibgut, Blütencamping Riegelspitze, Campingpark Sanssouci and 8 more
- 151hotels and guesthouses within 8 kmPension Sanssouci, Hundeschule & -Pension, Pension Weller am Krongut and 148 more
- 239restaurants and cafés within 3 km
- other cave entrances within 3 km
- springs within 2 km
- sinkholes within 3 km
- caving clubs and spots within 15 km
Counted in OpenStreetMap, the map anyone can edit, around the entrance. A low number may just mean nobody has mapped it yet. © OpenStreetMap contributors (ODbL).
Towns nearby
- Potsdam1.7 km in a straight line
- Werder7.8 km in a straight line
- Wannsee7.9 km in a straight line
- Kladow8.9 km in a straight line
- Nikolassee9.9 km in a straight line
- Michendorf10 km in a straight line
- Stahnsdorf12 km in a straight line
- Kleinmachnow12 km in a straight line
In our other atlases
What else is around Neptune Grotto.
The river at the entrance, the waterfalls, the lakes, the mountains and volcanoes above, the canyons, beaches and islands nearby — from our other atlases.
Lakeyas16 lakes within 10 km
Peakyas45 mountains within 10 kmFigures from the sister sites' databases (Wikidata, HydroATLAS, GeoNames, NOAA, OpenStreetMap). Links open when each site is online.
Month by month
The weather outside, at the entrance.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Afternoon | 2 | 4 | 8 | 14 | 20 | 24 | 26 | 26 | 21 | 14 | 7 | 3 |
| Afternoon | 2 | 4 | 8 | 14 | 20 | 24 | 26 | 26 | 21 | 14 | 7 | 3 |
| Night | -3 | -3 | -1 | 4 | 8 | 13 | 15 | 14 | 10 | 5 | 2 | -1 |
| Rain (mm) | 54 | 38 | 40 | 28 | 53 | 57 | 81 | 58 | 49 | 49 | 49 | 48 |
| Rainy days | 12 | 10 | 11 | 8 | 10 | 12 | 13 | 12 | 9 | 10 | 10 | 12 |
| Sun hours/day | 0.8 | 2.2 | 3.6 | 6.0 | 6.6 | 7.0 | 6.4 | 6.0 | 5.0 | 2.9 | 1.0 | 0.4 |
| Snow on the ground (cm) | 14 | 13 | 7 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 4 | 11 |
| Afternoon | Afternoon | Night | Rain (mm) | Sun hours/day | |
|---|---|---|---|---|---|
| Jan | 2 | 2 | -3 | 54 | 0.8 |
| Feb | 4 | 4 | -3 | 38 | 2.2 |
| Mar | 8 | 8 | -1 | 40 | 3.6 |
| Apr | 14 | 14 | 4 | 28 | 6.0 |
| May | 20 | 20 | 8 | 53 | 6.6 |
| Jun | 24 | 24 | 13 | 57 | 7.0 |
| Jul | 26 | 26 | 15 | 81 | 6.4 |
| Aug | 26 | 26 | 14 | 58 | 6.0 |
| Sep | 21 | 21 | 10 | 49 | 5.0 |
| Oct | 14 | 14 | 5 | 49 | 2.9 |
| Nov | 7 | 7 | 2 | 49 | 1.0 |
| Dec | 3 | 3 | -1 | 48 | 0.4 |
Averages 1991–2020 (NASA POWER) for a cell about 55 km wide, brought to the altitude of the entrance (44 m) with the standard lapse rate. Not a forecast.
Photographs
Inside and around.
Recent years
Wet years, dry years.
Rain of each month as a share of the 1991–2020 average. A dry year means a lower river and hotter rock; a wet one, more water in the gorge.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2020 | 73% | 235% | 85% | 44% | 73% | 121% | 57% | 112% | 110% | 176% | 36% | 62% |
| 2021 | 112% | 111% | 95% | 119% | 112% | 81% | 133% | 168% | 73% | 63% | 146% | 101% |
| 2022 | 65% | 178% | 6% | 121% | 67% | 64% | 51% | 85% | 106% | 57% | 44% | 122% |
| 2023 | 130% | 128% | 189% | 184% | 29% | 154% | 67% | 130% | 27% | 235% | 146% | 218% |
| 2024 | 93% | 214% | 75% | 127% | 111% | 106% | 109% | 49% | 96% | 85% | 120% | 84% |
| 2025 | 122% | 60% | 41% | 52% | 73% | 72% | 175% | 52% | 99% | 123% | 109% | 51% |
130% or more: wet month 70% or less: dry month
Caves nearby.
Neptune Grotto
Germany
- —Depth
- —Galleries
- 44 mEntrance altitude
- 10 °CInside, all year
Daneil's Cave
Germany · 148 km
- —Depth
- —Galleries
- 234 mEntrance altitude
- 9 °CInside, all year
Baumann's Cave
Germany · 167 km
- —Depth
- —Galleries
- 404 mEntrance altitude
- 8 °CInside, all year
Where these figures come from
| Name, type, published depth and length, visitors | Wikidata (Q526924) · CC0 |
|---|---|
| The relief above, the entrance altitude, the section and the 3D model | Copernicus DEM GLO-30 · © DLR e.V., © Airbus Defence and Space GmbH, Copernicus/ESA |
| Climate | NASA POWER, 1991–2020 |
| Entrances, springs, sinkholes, opening hours and what is around | © OpenStreetMap contributors · ODbL |
| Images | EOX Sentinel-2 cloudless 2016 · CC BY 4.0; Wikimedia Commons |
| Rivers, waterfalls, lakes, mountains, canyons, beaches and islands nearby | Coastya, Lakeyas, Peakyas, Cascadyas, Islandyas, Riveryas |
Every figure is an average, an estimate or a count from a public dataset. Licences and methods: data sources.
The family
Do you prefer beaches, lakes, mountains, waterfalls, islands, rivers, canyons, caves, dark skies, viewpoints, birdwatching or forests?
Same idea, other landscapes: field atlases built on open data, month by month, in seven languages.
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Where the night is still dark: the sky of every place, the Milky Way month by month, the Moon, eclipses and auroras.Coming soonVisit 
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Every viewpoint with its real 360° panorama: the peaks you can name, how far you see and where the sun sets.Coming soonVisit 
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forests
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