The 1.5 square miles [4 sq km] of the old city rest within 25 - foot - high [8 m] walls, 10 feet [3 m] thick at the base. A 200 - foot - wide [70 m] moat complements the walls.
Četrus kvadrātkilometrus plašo vecpilsētu ieskauj 8 metrus augsts un pie pamata 3 metrus biezs mūris, ko apņem 70 metrus plats aizsarggrāvis.