The castle is constructed on a rocky mount jutting out into the River Wyvern. It is square in plan and has two concentric lines of fortification. The first line of defence is an outer curtain wall of 300 feet on the side, encircling the entire castle and forming the outer ward.
The fortress is built on a rugged promontory extending into the River Wyvern. It has a rectangular layout and features two successive lines of fortification. The initial line of defense consists of an outer wall, 300 feet in length, surrounding the entire castle and forming the outer bailey.