A moat, wide and deep, runs around the city.Over the moat, there used to be a huge suspension bridge which cut off the way in and out of the city, once lifted.

• 城四周环绕着又宽又深的护城河，正对城门处设有可以随时起落的吊桥，吊桥一升起，进出城的通路便被截断。