Berenice Troglodytica, also called Berenike (Greek: ) or Baranis, is an ancient seaport of Egypt on the western shore of the Red Sea. It is situated about 825 km south of Suez, 260 km east of Aswan in Upper Egypt and 140 km south of Marsa Alam. It was founded in 275 BCE by Ptolemy II Philadelphus (285–246 BCE), who named it after his mother, Berenice I of Egypt. A high mountain range runs along the African coast and separates the Nile Valley from the Red Sea; Berenice was sited upon a narrow rim of shore between the mountains and the Red Sea, at the head of the Sinus Immundus, a south-facing bay sheltered on the north by a high peninsula then called Lepte Extrema, and to the south by a chain of small islands scattered across the mouth of the bay. One of them was called the Island of Ophiodes () and was one of a few sources of gemstones local to Berenice. The harbour is marginal, but was improved by engineering. Etymology The name Troglodytica refers to the native people of the region, the "Troglodytai" or "cave dwellers". Although the name is attested by several ancient writers, the more ancient Ptolemaic inscriptions read Trogodytai, which Huntingford (1980) speculated could be derived from the same root as Tuareg. It is possible that later copyists confused this name with the more common term Troglodytai. History Ptolemaic era Berenice was prosperous and quite famous in antiquity. The city is noted by most ancient geographers, including Strabo, Pliny the Elder, and Stephanus of Byzantium. Its prosperity after the third century was mostly due to three reasons: patronage by the Ptolemaic kings safe anchorage being at the eastern terminus of the main road from Upper Egypt. The other terminus of that road is Coptos (now Qift), an Egyptian city on the Nile, which made Berenice and Myos Hormos the two main shipping centers for trade between Aethiopia and Egypt on the one hand, and Syria, Tamilakkam, and Tamraparni (ancient Sri Lanka) on the other. The road across the desert from Coptos was 258 Roman miles long, or 11 days' journey. Watering stations (Greek hydreumata, see Hadhramaut) were built along the road; the wells and resting places for caravans are listed by Pliny, and in the Itineraries. In the 19th century Belzoni found traces of several of the watering stations. Berenice was able to