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The Red Sea is traditionally supposed to be the sea in the book of Exodus (chapters 14-15), where God parts the sea, so that the children of Israel can walk on the sea floor and escape from the Egyptians’ chase.
However, the Hebrew name for the sea in Exodus 15;4, 22 is Yam Suph, meaning ‘sea of reeds’ (also Exod 10:19; 13:18; 23:31; Num 14:25). It is not clear that this does in fact mean the Red Sea, and the sea of this event is often supposed to be one of the lakes through which the Suez Canal now passes.