Pierre blanche menhir, Menhir in Oudon, Loire-Atlantique, France

The Pierre Blanche menhir is a block of white quartz standing in a field near the hamlet of Pierre Blanche, about three kilometres west of Oudon in Loire-Atlantique. It measures 4.30 metres high, 3.60 metres wide and about 3 metres thick. Its light grey surface has darker streaks, a vertical ridge on the right side and a small dark hollow near the middle.

This stone block was erected during the Neolithic period and belongs to a group of megalithic monuments left by prehistoric civilizations in the region. Its age spans several thousand years and reflects early human activity in western France.

The menhir represents a link between prehistoric communities and the western French landscape. It shows how megalithic structures held importance for early peoples in marking territory and community identity.

The menhir sits in open terrain and is reachable on foot via local paths, with best conditions during fair weather. Visitors should wear sturdy footwear and be prepared to explore the immediate surroundings independently.

Several flint axes were found near the stone, indicating activity around it in prehistoric times. The menhir is made of white quartz and stands about 4.3 m tall, roughly 3 m wide at its broadest point. A local legend holds that the stone turns on itself once a year at midnight, and only the elves know the date.