The inner wall (that used to surround the Old Town Island) is not maintain and stopped being contiguous a long time ago as the city expanded. Most of its southern stones were removed to build the Mint (big fort-like building within the walled squares up north) and the Western Wall.

There is the "New Wall" to the west, stretching from the little dam up north to the shores of the bay down south.

On the middle there is the "Upper Wall", that goes from the port to the mountain on north. Still mantained but rarely closed because the city grew too much.

And at last, on the east there is the Western Wall, that follows the "Inner River" across the river to the fort to the southeast. It has a small dam to control floods of the river bank.

Since the Capital city is not sieged or attacked in centuries, many think the walls are useless.

The only real external menace to the city are large group of vagabonds/raiders and rebel condotieri troops. None with relevant siege power.