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the Degree Confluence Project
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France : Île-de-France

1.9 km (1.2 miles) N of Triel-sur-Seine, Yvelines, Île-de-France, France
Approx. altitude: 181 m (593 ft)
([?] maps: Google MapQuest Multimap world confnav)
Antipode: 49°S 178°W

Accuracy: 8 m (26 ft)
Click on any of the images for the full-sized picture.

#2: View to the South #3: View to the West #4: View to the North #5: View to the East #6: GPS reading #7: Ground zero #8: The Confluence Hunters #9: Former quarries hold the risk of collapsing #10: The muddy path near the Confluence

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  49°N 2°E (visit #13) (secondary) 

#1: The Confluence from 20 m

(visited by Rainer Mautz and Elionora)

27-Jan-2014 -- We spent an extended weekend in Paris. After visiting the Moulin Rouge and the Catacombes on the previous days, we decided to have a break from the city on our last day. From Saint-Lazare Station, we took a 45-minute train to Triel-sur-Seine. 2.5 km beeline distance was now ahead of us. From the train station, we ascended steadily and when we entered the forest the path became muddy and slippery. It was raining slightly.

By simply following the path straight on, we reached the Confluence. The exact location was in a depression about 20 m from the path. Obviously this huge hole was not of a natural origin. First I thought this could be a bomb crater from World War II. But then I read a sign that explained the situation. “ANCIENNES CARRIÈRES - RISQUES D’EFFONDREMENTS”, which means that former quarries hold the risk of collapsing. I directly linked this situation with the catacombs, which are also former quarries that had been collapsing from time to time endangering buildings and people.

We went around the pit and also inside to get the zero reading. Interestingly, the Confluence marks almost the center of the crater.

On the way back, we took a longer way and hiked for two hours. At Conflans-Fin-d’Oise (note that it is not Confluence-Fin-d’Oise) a train took us back to Paris and a TGV back to Zurich.

CP Visit Details:

  • Distance to a road: 800 m
  • Time at the CP: 12:15 PM
  • Distance from train station: 2.5 km
  • Time to reach the CP from the station: 45 minutes
  • Measured height: 181 m
  • Minimal distance according to GPS: 0 m
  • Position accuracy: 8 m
  • Topography: slightly hilly, in a depression
  • Vegetation: deciduous forest (oak, birch), moss
  • Weather: light rain, 6° C (felt temperature)
  • Given Name: The Catacombes Confluence


 All pictures
#1: The Confluence from 20 m
#2: View to the South
#3: View to the West
#4: View to the North
#5: View to the East
#6: GPS reading
#7: Ground zero
#8: The Confluence Hunters
#9: Former quarries hold the risk of collapsing
#10: The muddy path near the Confluence
ALL: All pictures on one page (broadband access recommended)