The historic Fornet is located on the left bank of the Isère which keeps it protected from avalanches and rock falls. The extension of the Fornet on the right bank, where you stand, was only allowed with the construction of this tourne (mound + ditch) against avalanches and rock falls. Also notice the absence of walls that face its slopes. In the eighteenth century, the Fornet d´Aval, between the Laisinant and the current Fornet, was completely destroyed by an avalanche. The ruins remain visible.