Arabian Sea, the Mare Erythrum ('Red Sea') of the ancients (though these terms appear to have been applied with considerable vagueness), is that part of the Indian Ocean which lies between India on the east and Arabia on the west. Its most natural and convenient limit on the south is a line drawn from Cape Comorin to Cape Guardafui. Its two great arms are the Red Sea proper and the Persian Gulf.
Arabian Sea
Chambers's Encyclopaedia, Volume 1: A to Beaufort, p. 368
Source scan(s): p. 0387