The city was surrounded by powerful walls with four entry doors located in the cardinal points. It was rebuilt a part of the walls with the North door defended by two square towers with a wooden structure. Its basis is about 4m wide. It was realized with stone till a higher of about 3,5m. The tower was surmounted by a narrower parapet with a higher of 1,5m. The walls were realized with adobe and wooden poles that leave a path or a passage walk. This entry is the easier access (as the plan of the present road proves) and gives a limit reference of the city.
