Red Sea

American  

noun

1. an arm of the Indian Ocean, extending northwest between Africa and Arabia: connected to the Mediterranean by the Suez Canal. 1,450 miles (2,335 kilometers) long; 170,000 square miles (440,300 square kilometers); greatest depth, 7,254 feet (2,211 meters).

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Red Sea British  

noun

1. a long narrow sea between Arabia and NE Africa, linked with the Mediterranean in the north by the Suez Canal and with the Indian Ocean in the south: occasionally reddish in appearance through algae. Area: 438 000 sq km (169 000 sq miles)

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Red Sea Cultural  

1. Narrow sea between Africa and the Arabian Peninsula.

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Discover More

According to the Bible (see also Bible), the Red Sea's waters parted to allow the Israelites, led by Moses, to escape the pursuing Egyptian army. The “Red Sea” of the biblical account, however, seems more likely to have been the marshy Sea of Reeds than the present-day Red Sea.

Probably named for the red algae that are sometimes present in its waters.

Etymology

Origin of Red Sea

Translation of Latin Mare Rubrum, from Greek Erythrà Thálassa “Red Sea,” a translation of Hebrew Yam Sūph “Sea of Reeds.” The reason for Erythrà (Thálassa) is unknown; perhaps Erythrà refers to seasonal blooms of red algae on the on the surface of the water, or to ancient associations of “red” with “south,” (as “black” with “north,” as in “Black Sea”)

Example Sentences

They include Saipem, which worked on the Saudi pipeline to the Red Sea.

From Barron's • Jun. 23, 2026

Saudi Arabia built a pipeline to the Red Sea in the 1980s that can transport up to seven million barrels a day of oil.

From Barron's • Jun. 23, 2026

The president also described the coastline, close to the mouth of the Red Sea, as "strategic".

From BBC • Jun. 16, 2026

Saudi Arabia has a pipeline to the Red Sea but it has limited capacity.

From The Wall Street Journal • Jun. 7, 2026

And then Mr. Stonecrop was there, his large self parting the crowd like Moses holding out his staff over the Red Sea.

From "Lizzie Bright and the Buckminster Boy" by Gary D. Schmidt