The castle curtain wall is only 112 meters (about 350
feet) long, which makes Avalon one of the smallest castle of the Dauphiné
Its southern front is protected by
a "barbican" in which stables were built (as usual,
it was impossible to access the castle on horse).
The keep is 26-meter high (about 80 feet) and is
toped by a small watch turret. It is the main defensive element of the
The small bailey is packed with various
buildings: the "aula" (the Lord's great hall), the bakery, the
wardrobe, the cellar, etc.