Maciej Paprocki, Roads in the Deserts of Roman Egypt: Analysis, Atlas, Commentary [2019], pp.201-5:
6.1.1 6.1.1. Alexandria–Abu Sir–Sallum road (Marmarica coastal main road) (Maps 11 and 13)
Travelled by parties coming from Egypt to Libya and vice versa, the Marmarica coastal road constituted Egypt’s main corridor to Cyrenaica. The trail originated in the vicinity of modern Alexandria and ran westwards by the coast. [...] [In the 1930s] Oliver and De Cosson ... surmised the track they uncovered [was perhaps] an old Ramesside trail that linked the Delta to a New Kingdom fort at Zawiyet Umm al-Rakham {Apis: on Mediterranean coast, 18 km west of Paraetonium} . ... The first region the Marmarica road traversed as it went west from Alexandria was the Maryut strip, a land wedged between the Mediterranean and the Mareotic Lake. The area remained relatively unprotected throughout much of the Dynastic period, ... [but the] coast attracted a larger degree of Egyptian interest in the Early New Kingdom period, when Ramesses II’s fortress was built at the westernmost point of Egypt, Apis (modern Zawiyet Umm al-Rakham), to guard the area against Libyan nomads invading from the west.14 It remains an open issue whether the Maryut region and adjacent lands held an entire chain of Ramesside military installations ... More enthusiastic scholars argued these finds marked the sites of former Ramesside forts ... Admittedly, the Maryut strip was of prime strategic importance for the Western Delta, and archaeological finds indicate a military presence in the area throughout much of the Antiquity, but whether it was guarded at that time remains uncertain.
The capital of the region was Marea (modern Hawariyya), an ancient settlement on the southern shore of Lake Mareotis that profited from canals linking the lake to the Nile.17 Herodotus records that Marea served as a guard post on the Libya-Egypt border during the Twenty-Sixth Dynasty.18 The region’s heyday started in the Persian period, when Marea won independence from Egypt and became a capital of the Libyco-Egyptian kingdom comprised of the lands between the Canopic Nile branch and Cyrenaica. The key player in the local trade and politics, the Mareotic monarch Inaros II first ruled with Persian approval, but he eventually revolted against his overlords. [...] {After 450 BC} the prosperous Mareotic kingdom was ultimately divided, with the Maryut strip reverting to Egypt and the Marmarica coast granted to Libyan rulers. Marea flourished well into the Ptolemaic and Roman periods, eventually becoming an important regional trade hub, thanks to its favourable location.19
The Marmarica coastal road originated in Alexandria and ran southwest along the Maryut strip, running by a series of Christian monasteries at Pempton, Enaton, and Oktokaidekaton, situated respectively at the fifth, ninth, and eighteenth mile of the road24. In its run, the road traversed the rocky Taenia (ταινία [tainia], Greek for ‘strip’, modern Abu Sir) ridge, from which the region took its name,25 these limestone hills separating the Mediterranean Sea from Lake Mareotis. The ridge abounds in ancient ruins and quarries, the majority of them still unexcavated.26 On its way, the road went by a Pharaonic/Ptolemaic/Roman site at Kôm el Nugûs, securely identified with ancient Plinthine*. Recent excavations in the vicinity of the site uncovered large amounts of Archaic and Classical Greek imports at the site and demonstrated constant occupation of the site throughout much of the Late and the Graeco-Roman periods.27 The first major settlement on the road was Taposiris Magna (Abu Sir), a major coastal site recently excavated by several French archaeological missions. Occupied in the Graeco-Roman period (3rd century BCE–7th century CE), the city was situated on the southern slope of Taenia ridge facing Lake Mareotis; an important port at the navigable limit of the western portion of the lake, Taposiris accepted and sent on the goods that were shipped to Libya through the Canopic Nile branch and Lake Mareotis.28 Remains of an extensive ancient irrigation system indicate the area was a regional breadbasket and winemaking centre, with ancient authors extolling the taste and quality of Taeniotic and Mareotic wines.29 Today, the site is famous for its miniature replica of the Pharos lighthouse Ptolemy II Philadelphus built there.30
Travelled by parties coming from Egypt to Libya and vice versa, the Marmarica coastal road constituted Egypt’s main corridor to Cyrenaica. The trail originated in the vicinity of modern Alexandria and ran westwards by the coast. [...] [In the 1930s] Oliver and De Cosson ... surmised the track they uncovered [was perhaps] an old Ramesside trail that linked the Delta to a New Kingdom fort at Zawiyet Umm al-Rakham {Apis: on Mediterranean coast, 18 km west of Paraetonium} . ... The first region the Marmarica road traversed as it went west from Alexandria was the Maryut strip, a land wedged between the Mediterranean and the Mareotic Lake. The area remained relatively unprotected throughout much of the Dynastic period, ... [but the] coast attracted a larger degree of Egyptian interest in the Early New Kingdom period, when Ramesses II’s fortress was built at the westernmost point of Egypt, Apis (modern Zawiyet Umm al-Rakham), to guard the area against Libyan nomads invading from the west.14 It remains an open issue whether the Maryut region and adjacent lands held an entire chain of Ramesside military installations ... More enthusiastic scholars argued these finds marked the sites of former Ramesside forts ... Admittedly, the Maryut strip was of prime strategic importance for the Western Delta, and archaeological finds indicate a military presence in the area throughout much of the Antiquity, but whether it was guarded at that time remains uncertain.
The capital of the region was Marea (modern Hawariyya), an ancient settlement on the southern shore of Lake Mareotis that profited from canals linking the lake to the Nile.17 Herodotus records that Marea served as a guard post on the Libya-Egypt border during the Twenty-Sixth Dynasty.18 The region’s heyday started in the Persian period, when Marea won independence from Egypt and became a capital of the Libyco-Egyptian kingdom comprised of the lands between the Canopic Nile branch and Cyrenaica. The key player in the local trade and politics, the Mareotic monarch Inaros II first ruled with Persian approval, but he eventually revolted against his overlords. [...] {After 450 BC} the prosperous Mareotic kingdom was ultimately divided, with the Maryut strip reverting to Egypt and the Marmarica coast granted to Libyan rulers. Marea flourished well into the Ptolemaic and Roman periods, eventually becoming an important regional trade hub, thanks to its favourable location.19
The Marmarica coastal road originated in Alexandria and ran southwest along the Maryut strip, running by a series of Christian monasteries at Pempton, Enaton, and Oktokaidekaton, situated respectively at the fifth, ninth, and eighteenth mile of the road24. In its run, the road traversed the rocky Taenia (ταινία [tainia], Greek for ‘strip’, modern Abu Sir) ridge, from which the region took its name,25 these limestone hills separating the Mediterranean Sea from Lake Mareotis. The ridge abounds in ancient ruins and quarries, the majority of them still unexcavated.26 On its way, the road went by a Pharaonic/Ptolemaic/Roman site at Kôm el Nugûs, securely identified with ancient Plinthine*. Recent excavations in the vicinity of the site uncovered large amounts of Archaic and Classical Greek imports at the site and demonstrated constant occupation of the site throughout much of the Late and the Graeco-Roman periods.27 The first major settlement on the road was Taposiris Magna (Abu Sir), a major coastal site recently excavated by several French archaeological missions. Occupied in the Graeco-Roman period (3rd century BCE–7th century CE), the city was situated on the southern slope of Taenia ridge facing Lake Mareotis; an important port at the navigable limit of the western portion of the lake, Taposiris accepted and sent on the goods that were shipped to Libya through the Canopic Nile branch and Lake Mareotis.28 Remains of an extensive ancient irrigation system indicate the area was a regional breadbasket and winemaking centre, with ancient authors extolling the taste and quality of Taeniotic and Mareotic wines.29 Today, the site is famous for its miniature replica of the Pharos lighthouse Ptolemy II Philadelphus built there.30
* Independently, I've identified this exact location to be (on today's maps) near the gas station at Al Jamiah. There is no evidence of the (presumed) fortress complex on the limestone hill which has now been heavily mined but remains the high point of the narrow strip.