Dive-site story
Lac des Ciments, situated in Beaumont-sur-Oise, is a flooded former chalk quarry turned dedicated inland diving facility managed by the French diving federation. The quarry basin features chalk cliffs, submerged training platforms, and remnants of its industrial past. Because the lake is fed by groundwater permeating through limestone, water clarity often exceeds typical regional lakes, although pronounced thermoclines develop throughout the warmer months.
Submerged training platforms and navigation courses tailored for skill practice
Sheer submerged chalk walls and chalky bottom topography
Encounters with large predatory pike hunting around weed beds and sunken structures
Location
Use the map to plan with your operator and confirm the exact entry point on the day.
Seasonality
Late spring through autumn provides warmer surface layers and better visibility before heavy winter chill sets in.
Marine life
| Species | Likelihood | J | F | M | A | M | J | J | A | S | O | N | D |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Northern PikeEsox lucius | Common | ||||||||||||
| European PerchPerca fluviatilis | Common | ||||||||||||
| Common CarpCyprinus carpio | Common | ||||||||||||
| Common RoachRutilus rutilus | Common | ||||||||||||
| Signal CrayfishPacifastacus leniusculus | Common |
Marine forecast
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