Lac Bleu, Lake in Watten, France.
This former clay quarry spans 13 hectares and features deep blue waters surrounded by forests, meadows, and wetlands that support diverse wildlife including deer, wild boar, and numerous amphibian species.
The site was intensively exploited as a clay quarry by the Tuileries du Nord until the 1980s, when it resembled a lunar landscape before being transformed into a protected natural area.
The lake serves as an educational center where visitors can participate in nature walks, biodiversity workshops, and bat observation activities organized by local conservation groups throughout the year.
Swimming and access to the shoreline are strictly prohibited for safety and environmental protection, but fishing is permitted under supervision of the local fishing association from Bourbourg.
The water changes color dramatically from deep blue to turquoise depending on lighting and weather conditions, creating a natural phenomenon that attracts photographers and nature enthusiasts.
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