The Erythraean Sea is an ancient name for the Indian ocean or its attached gulfs, specifically, the Persian Gulf and the Red Sea.
The Indian Ocean, specifically the arm between Africa and India, was given this name, but it was also applied to either of the two arms of the ocean: the Red Sea and the Persian Gulf. The name of the Red Sea country of Eritrea in Africa references this name, a term for a reddish color in the waters.
* The presence of seabirds would indicate the location and distance of land masses.* It is known ancient sailors were able to navigate by the use of stars.* Early mariners may have known that ocean currents vary during different times of the year.
In ancient times the strongest acid known was vinegar.
Gaul was the name of France in ancient times.
Patliputra
Not yet known, we don't really know if they did play this sport in ancient times.
sutlej
Lebanon was known for its ancient cedars. Found in my History book, ''History of the World''.
Lead has been known from ancient times and thus nobody knows who first discovered it.
No body really known as it has been Known since ancient times.
Often Latin.
Delphi