The three towers of the Huerta del Carmen were, along with a piece of the escarpment of the moat of the northern enclosure, the only remains of the Andalusian city that remained on the surface at the end of the century since the destruction of the city in 1379 "Siege of Algeciras (1369)"). Both the archaeological excavations carried out between 1997 and 1998 in the northern enclosure and those currently carried out in this southern enclosure have revealed the importance of the static defenses of Al-Yazirat al-Hadrá.

As revealed by various excavations carried out in the area and various plans of the century, the complete structure of the fence would be formed by a wall with towers at regular intervals, list, barbican and escarpment. There is no documentary or archaeological evidence of the presence of a moat and in some plans the presence of a door in the eastern part of the wall is intuited. The archaeological remains visible today, awaiting new archaeological interventions, correspond to three towers of the fence, several meters of the barbican and the escarpment and a ceramic kiln from the 19th century.

Although currently only its core and a few rows of ashlars are preserved, with a maximum elevation of 2 meters, the archaeological excavations carried out at the site showed that originally they had a square plan, 5.4 meters wide on each of their sides and that they were attached to the wall. Towers 1 and 2, the westernmost ones, are 28 meters apart and towers 2 and 3 are about 130 meters apart, so it is calculated that the total number of towers existing in that section of wall must have been 6, 7 if the section of wall between tower 3 and the albarrana tower is considered.

The towers have a solid calicanto core with several courses of masonry covering its exterior as reinforcement. The hypothesis currently considered for the chronology of these towers maintains that they must have been built by the Benimerines around 1282 to 1285 with the rammed earth technique, along with the barbican and the wall. Later, most likely when the city was under Nasrid rule between 1312 and 1329, these towers were reinforced with a masonry lining on their three faces. This lining would be made up of sandstone stones in courses filled with calcarenite and reinforced in the corners with larger calcarenite ashlars. To support this masonry lining, a plinth about 75 cm high was added to the base of the towers, protruding about 10 centimeters from the ashlars added above.[6]​.

The wall, currently very razed, has a maximum width of 2.10 meters and was built with rammed earth covered with masonry.[7]​[8]​ Most of its remains are currently located under the Paseo de la Conference and have not been able to be studied in detail. It seems to be part of the original Benimeri defense system from 1282 to 1285 due to the presence of a core of poured rammed earth similar to that of the towers and it is unknown if the masonry lining that it appears to present corresponds to a Nasrid reform similar to that carried out on the towers.[6]​.

The barbican was built, like the wall, with a calicanto core and reinforced in some areas by courses of masonry. It is located 7 meters from the wall and the towers, adapting its layout to the perimeter of the fence.

In various areas of this structure, two construction stages can be observed, the original one made of rammed earth and one made of masonry. Perhaps, as happened with the towers, this barbican was reinforced in the Nasrid period, although it is also probable that these additions do not correspond to a large-scale reinforcement plan but rather simple repairs. Between towers 2 and 3, the presence of a wall further forward of the barbican has been observed, which some authors had interpreted as a third defensive line. In the absence of new archaeological excavations, it has been proposed that this wall could correspond to part of the elbow access from the barbican to the open door in the wall that some plans of the century seem to represent.

A third defensive line is represented as a covered calicanthus escarpment located 16 meters from the barbican. This second barbican has a slope escarpment in its external area and must have a vertical upper area. It is made with a core of calicanthus in contact with the slope and an external sheet of regular masonry in courses alternating with slabs. In several points of this barbican, Christian stonemason marks have been located similar to those located on the walls of the northern enclosure of the city and located chronologically in the reinforcement of the defenses carried out during the reign of Alfonso XI after the conquest of the city in 1344.[6]​[10]​.

The defensive function of this wall system was supported by the presence of a barran tower at its southeastern end. This tower has been identified with the Torre del Espolón that appears in the Castilian Chronicles, an octagonal tower with a maximum width of 6 meters and about 12 meters high that extended several meters into the sea having been built on the rocks of the cliff. It would have a lime and stone plinth with a single room in its upper half and was joined to the wall by a corcha with a walkway. However, this tower is mentioned in 1730 as Torre de Don Carlos and in 1796 as Torre de Don Rodrigo and was reused in the century as a gunpowder warehouse to be later abandoned and fall on November 25, 1901 due to a storm.

The most recent descriptions, and their cartographic representations, show a square tower, made of masonry and ashlar, just over 13 meters high, with a vaulted room integrated into the walls, so it is doubtful that it was really the same tower that is named in medieval texts. Its remains, which remained for several decades known as Piedra Morena, were completely destroyed in the middle of the century during an expansion of the Port of Algeciras.[11]​.

In December 2016, the Algeciras City Council, through the Culture delegate Pilar Pintor, presented a project for the excavation and enhancement of the remains of the walls of the Huerta del Carmen that had been drawn up by the company Yamur Arquitectura. This project would have the investment of the Ministry of Public Works.[12]​ In May 2017, the first phase of excavations began, which aims to excavate and evaluate the structures preserved on the site. A second phase of the project contemplates the consolidation and integration of the remains in an archaeological park.[13]​.

• - Wikimedia Commons hosts a multimedia category on Huerta del Carmen.

Since the 16th century, the city of Al-Jazeera al-Jadra had two enclosures or villas separated by the Honey River. The written sources of the time, such as the Chronicle of Alfonso

Traditionally, the Old Town has been located in the southern area of ​​Algeciras. This thesis maintained by Jorge Próspero de Verboom, Emilio Santacana y Mensayas, Manuel Pérez-Petinto, Cristóbal Delgado Gómez and Antonio Torremocha among others, identifies the term Villa Vieja used in the century for the medieval remains visible on the hill located in front of Isla Verde with the toponym Villa Vieja from ancient sources. According to this theory, the southern enclosure would be the first to be occupied in 711 and the northern enclosure would be the one built in 1285 by the Benimerines.[2]​.

Recent investigations in various archaeological sites in the city such as the walls of the northern town have revealed the inaccuracy of the traditional approach. The current thesis defended by historians Rafael Jiménez-Camino and José María Tomassetti among others maintains that the Old Town of medieval sources is the northern enclosure. To locate these toponyms, they use the description of the siege of the city "Sitio de Algeciras (1342)") in 1344 by Alfonso Onceno, which refers to the points perfectly identified as the Torre de los Adalides, located to the north of the city, as closer to the Old Town and, therefore, to the northern enclosure. The appearance of houses prior to the founding of the Villa Nueva in the northern area and the absence of constructions in the period of time between the Roman occupation and the century in the southern area seem to support this hypothesis.[3]​.

In this way, in the archaeological site of Huerta del Carmen, located in the area called Villa Vieja since the 19th century, the remains of the fence of the medieval Villa Nueva called Al-Bunayya or Almanzora, built from 1282 by the Merinids of Abu Yusuf Yacub) can be seen in the place occupied by the Castilian camp of Alfonso (1278-1279)") from 1279, on the south bank of the Miel River.[4]​ In this way, the stratigraphic sequence of the area identifies Roman construction elements of the century corresponding to the salting factory "Roman salting factory (Algeciras)") of Iulia Traducta immediately below the medieval remains.[5]​.

The three towers of the Huerta del Carmen were, along with a piece of the escarpment of the moat of the northern enclosure, the only remains of the Andalusian city that remained on the surface at the end of the century since the destruction of the city in 1379 "Siege of Algeciras (1369)"). Both the archaeological excavations carried out between 1997 and 1998 in the northern enclosure and those currently carried out in this southern enclosure have revealed the importance of the static defenses of Al-Yazirat al-Hadrá.

As revealed by various excavations carried out in the area and various plans of the century, the complete structure of the fence would be formed by a wall with towers at regular intervals, list, barbican and escarpment. There is no documentary or archaeological evidence of the presence of a moat and in some plans the presence of a door in the eastern part of the wall is intuited. The archaeological remains visible today, awaiting new archaeological interventions, correspond to three towers of the fence, several meters of the barbican and the escarpment and a ceramic kiln from the 19th century.

Although currently only its core and a few rows of ashlars are preserved, with a maximum elevation of 2 meters, the archaeological excavations carried out at the site showed that originally they had a square plan, 5.4 meters wide on each of their sides and that they were attached to the wall. Towers 1 and 2, the westernmost ones, are 28 meters apart and towers 2 and 3 are about 130 meters apart, so it is calculated that the total number of towers existing in that section of wall must have been 6, 7 if the section of wall between tower 3 and the albarrana tower is considered.

The towers have a solid calicanto core with several courses of masonry covering its exterior as reinforcement. The hypothesis currently considered for the chronology of these towers maintains that they must have been built by the Benimerines around 1282 to 1285 with the rammed earth technique, along with the barbican and the wall. Later, most likely when the city was under Nasrid rule between 1312 and 1329, these towers were reinforced with a masonry lining on their three faces. This lining would be made up of sandstone stones in courses filled with calcarenite and reinforced in the corners with larger calcarenite ashlars. To support this masonry lining, a plinth about 75 cm high was added to the base of the towers, protruding about 10 centimeters from the ashlars added above.[6]​.

The wall, currently very razed, has a maximum width of 2.10 meters and was built with rammed earth covered with masonry.[7]​[8]​ Most of its remains are currently located under the Paseo de la Conference and have not been able to be studied in detail. It seems to be part of the original Benimeri defense system from 1282 to 1285 due to the presence of a core of poured rammed earth similar to that of the towers and it is unknown if the masonry lining that it appears to present corresponds to a Nasrid reform similar to that carried out on the towers.[6]​.

The barbican was built, like the wall, with a calicanto core and reinforced in some areas by courses of masonry. It is located 7 meters from the wall and the towers, adapting its layout to the perimeter of the fence.

In various areas of this structure, two construction stages can be observed, the original one made of rammed earth and one made of masonry. Perhaps, as happened with the towers, this barbican was reinforced in the Nasrid period, although it is also probable that these additions do not correspond to a large-scale reinforcement plan but rather simple repairs. Between towers 2 and 3, the presence of a wall further forward of the barbican has been observed, which some authors had interpreted as a third defensive line. In the absence of new archaeological excavations, it has been proposed that this wall could correspond to part of the elbow access from the barbican to the open door in the wall that some plans of the century seem to represent.

A third defensive line is represented as a covered calicanthus escarpment located 16 meters from the barbican. This second barbican has a slope escarpment in its external area and must have a vertical upper area. It is made with a core of calicanthus in contact with the slope and an external sheet of regular masonry in courses alternating with slabs. In several points of this barbican, Christian stonemason marks have been located similar to those located on the walls of the northern enclosure of the city and located chronologically in the reinforcement of the defenses carried out during the reign of Alfonso XI after the conquest of the city in 1344.[6]​[10]​.

The defensive function of this wall system was supported by the presence of a barran tower at its southeastern end. This tower has been identified with the Torre del Espolón that appears in the Castilian Chronicles, an octagonal tower with a maximum width of 6 meters and about 12 meters high that extended several meters into the sea having been built on the rocks of the cliff. It would have a lime and stone plinth with a single room in its upper half and was joined to the wall by a corcha with a walkway. However, this tower is mentioned in 1730 as Torre de Don Carlos and in 1796 as Torre de Don Rodrigo and was reused in the century as a gunpowder warehouse to be later abandoned and fall on November 25, 1901 due to a storm.

The most recent descriptions, and their cartographic representations, show a square tower, made of masonry and ashlar, just over 13 meters high, with a vaulted room integrated into the walls, so it is doubtful that it was really the same tower that is named in medieval texts. Its remains, which remained for several decades known as Piedra Morena, were completely destroyed in the middle of the century during an expansion of the Port of Algeciras.[11]​.

In December 2016, the Algeciras City Council, through the Culture delegate Pilar Pintor, presented a project for the excavation and enhancement of the remains of the walls of the Huerta del Carmen that had been drawn up by the company Yamur Arquitectura. This project would have the investment of the Ministry of Public Works.[12]​ In May 2017, the first phase of excavations began, which aims to excavate and evaluate the structures preserved on the site. A second phase of the project contemplates the consolidation and integration of the remains in an archaeological park.[13]​.

• - Wikimedia Commons hosts a multimedia category on Huerta del Carmen.