The tower, situated in the Bonod hamlet at an altitude of 744 m, can be reached on foot through a short path going from the hamlet of Isollaz.
Tall about twelve metres, cylindrical in form and with no turrets, it has a single, high entrance, reached via a ladder, which was then pulled up inside. It is said to have been used as a watchtower linking the castle of Graines with those of Villa (Challand) and Verrès, by using differently coloured fires according to the news to be transmitted.