The lake's water is famously turquoise due to its specific mineral composition and high limestone content.
The submerged village of Colletière dates back to the 11th century and was abandoned due to a rapid rise in water levels.
The lake is fed by underground springs rather than large river tributaries, which contributes to its water clarity.
The archaeological site of the lake provides some of the best-preserved wooden artifacts from the 11th century in Europe.
The Lac de Paladru Archaeological Museum (MALP) holds findings from the underwater excavations.
Lac de Paladru is the fifth-largest natural lake in France, located in the Isère department at an elevation of 492 meters. Known for its distinct turquoise water, the lake is glacial in origin and occupies a valley carved by the Würm glaciation. Archaeological excavations at the site, specifically at the sites of Colletière and Grands Roseaux, have revealed significant submerged medieval and Neolithic dwellings. The lake is a primary destination for recreational swimming, sailing, and rowing, with managed beaches available at Charavines and Paladru. Fishing is strictly regulated, with the lake known for populations of pike, perch, and char. The water temperature typically reaches 23-25°C during the peak summer months. It remains a key regional center for outdoor water sports and heritage tourism.
The viewpoint overlooking the lake from the heights of the village of Paladru.
Bring water shoes, as some swimming areas have pebbled lake beds.
Visit the dedicated museum in the village of Paladru to understand the historical context of the submerged ruins.
Book paddleboard or boat rentals in advance during the peak of the summer season to ensure availability.
Attempting to swim or anchor boats in protected archaeological zones designated by buoys.
Beaches operate primarily from late spring to early autumn; public access is limited outside of managed summer zones.
Respect protected natural zones near the reed beds; strictly adhere to water safety flags at beaches.
