The Heroopolite Gulf was the term used to describe the Gulf of Suez

Gulf of Suez

The northern end of the Red Sea is bifurcated by the Sinai Peninsula, creating the Gulf of Suez in the west and the Gulf of Aqaba to the east. The Gulf of Suez is formed within a relatively young, but now inactive rift basin, the Gulf of Suez Rift, dating back about 28 million years...

 in the vicinity of Heroopolis

Pithom

Pithom also called Per-Atum or Heroöpolis or Heroonopolis Pithom also called Per-Atum or Heroöpolis or Heroonopolis Pithom also called Per-Atum or Heroöpolis or Heroonopolis (Greek: or , Strabo xvi. 759, 768, xvii. 803, 804; Arrian, Exp. Alex. iii. 5, vii. 20; Joseph. Ant. Jud. ii. 7. § 5;...

 in ancient times when, as some sources believe, the Red Sea

Red Sea

The Red Sea is a seawater inlet of the Indian Ocean, lying between Africa and Asia. The connection to the ocean is in the south through the Bab el Mandeb strait and the Gulf of Aden. In the north, there is the Sinai Peninsula, the Gulf of Aqaba, and the Gulf of Suez...

 and its Gulf of Suez

Gulf of Suez

The northern end of the Red Sea is bifurcated by the Sinai Peninsula, creating the Gulf of Suez in the west and the Gulf of Aqaba to the east. The Gulf of Suez is formed within a relatively young, but now inactive rift basin, the Gulf of Suez Rift, dating back about 28 million years...

 extended as far northward as the Bitter Lakes of Egypt

Egypt

Egypt , officially the Arab Republic of Egypt, Arabic: , is a country mainly in North Africa, with the Sinai Peninsula forming a land bridge in Southwest Asia. Egypt is thus a transcontinental country, and a major power in Africa, the Mediterranean Basin, the Middle East and the Muslim world...

.

Ptolemy II Philadelphus

Ptolemy II Philadelphus

Ptolemy II Philadelphus was the king of Ptolemaic Egypt from 283 BCE to 246 BCE. He was the son of the founder of the Ptolemaic kingdom Ptolemy I Soter and Berenice, and was educated by Philitas of Cos...

 opened a west-east "Suez"

Suez Canal

The Suez Canal , also known by the nickname "The Highway to India", is an artificial sea-level waterway in Egypt, connecting the Mediterranean Sea and the Red Sea. Opened in November 1869 after 10 years of construction work, it allows water transportation between Europe and Asia without navigation...

 canal in Heroopolis

Pithom

Pithom also called Per-Atum or Heroöpolis or Heroonopolis Pithom also called Per-Atum or Heroöpolis or Heroonopolis Pithom also called Per-Atum or Heroöpolis or Heroonopolis (Greek: or , Strabo xvi. 759, 768, xvii. 803, 804; Arrian, Exp. Alex. iii. 5, vii. 20; Joseph. Ant. Jud. ii. 7. § 5;...

 (circa 270-269 BC) and constructed a navigable lock

Lock (water transport)

A lock is a device for raising and lowering boats between stretches of water of different levels on river and canal waterways. The distinguishing feature of a lock is a fixed chamber in which the water level can be varied; whereas in a caisson lock, a boat lift, or on a canal inclined plane, it is...

, with sluice

Sluice

A sluice is a water channel that is controlled at its head by a gate . For example, a millrace is a sluice that channels water toward a water mill...

s, between the Heroopolite Gulf and the Red Sea

Red Sea

The Red Sea is a seawater inlet of the Indian Ocean, lying between Africa and Asia. The connection to the ocean is in the south through the Bab el Mandeb strait and the Gulf of Aden. In the north, there is the Sinai Peninsula, the Gulf of Aqaba, and the Gulf of Suez...

 so as to allow the passage of vessels but prevent salt water from the Red Sea

Red Sea

The Red Sea is a seawater inlet of the Indian Ocean, lying between Africa and Asia. The connection to the ocean is in the south through the Bab el Mandeb strait and the Gulf of Aden. In the north, there is the Sinai Peninsula, the Gulf of Aqaba, and the Gulf of Suez...

 from mingling with the fresh water in the canal.

Ancient cities which were at one time situated along the coastline of the Heroopolite Gulf include Arsinoe

Arsinoe (Gulf of Suez)

Arsinoe or Arsinoites or Cleopatris or Cleopatra, was an ancient city at the northern extremity of the Heroopolite Gulf , in the Red Sea.-History:...

, Heroopolis

Pithom

Pithom also called Per-Atum or Heroöpolis or Heroonopolis Pithom also called Per-Atum or Heroöpolis or Heroonopolis Pithom also called Per-Atum or Heroöpolis or Heroonopolis (Greek: or , Strabo xvi. 759, 768, xvii. 803, 804; Arrian, Exp. Alex. iii. 5, vii. 20; Joseph. Ant. Jud. ii. 7. § 5;...

 and Olbia

Olbia (Egypt)

Olbia or Arsinoe was an ancient city in the Regio Troglodytica upon the western coast of the Red Sea between Philoteras and Myos Hormos. . The city was renamed from Olbia to Arsinoe by Ptolemy II in honor of Arsinoe II of Egypt, who was both his sister and wife. According to Agatharchides Olbia...

.