Frais-Puits

Frais-Puits is a water-filled sinkhole in Quincey with a funnel-shaped entrance at ground level. An underground network of connected passages carries water through the limestone, serving as a natural drainage and supply system for the area.

The site was first documented with a dive in 1938, marking the earliest recorded exploration of its underground passages. During the 1500s, heavy rain events here caused flooding that affected military movements in the region.

Local divers and cavers treat this place as a center for underground exploration, keeping alive a long tradition of investigating what lies below. The spring shapes how residents think about their water sources and the natural systems beneath their feet.

Access and water flow depend heavily on recent rainfall, with the strongest activity coming after storms. Visitors should be prepared for wet conditions and changing environments if exploring near the water.

Water flows through this spring only during rainy periods, making it an unpredictable natural display that changes with weather patterns. The speed and volume can shift dramatically within hours, creating a site that is never the same twice.

GPS coordinates: 47.59389,6.20543

Latest update: December 14, 2025 14:40