Le Planey is a small river in the Haute-Saône. Its wonderful source is on the domain of the commune of Anjeux and is worth every season a visit. It is a karstic source of the Vaucluse type. Its diameter is about 90 m and offers a magnificent color scheme in blue tones, ranging from sapphire to turquoise, which depend on the weather situation. The source is explored to a depth of about 35 meters and a length of about 185 m.
The average productivity is about 1,500 liters per second at a constant temperature of 11 ° C.
Sometimes one can distinguish the first meters of vertical rocks that make one think of an abyss. In times of flood, one easily notices the whirlwinds of the water which rises from the depths.
The point of view on the source is secured by a grid. All the rest is left in the state, natural and accessible, for this reason... caution! The dangers associated with the cool water temperature and the walls falling vertically are obvious. Less obvious is the danger of the nature of the soil: the fine silt deposits transform the whole Planey bed into a dangerous trap, causing a risk of bending! Never enter the Planey's bed. This concerns the whole of Planey, up to the mouth of the Semouse.
According to tradition, witches and magicians would have gathered at the "abyss of Planey" for the holding of their rites.