The Encyclopedia Americana (1920)/Mississippi Sound

MISSISSIPPI SOUND, an arm of the Gulf of Mexico, extending alone the coasts of Mississippi and Alabama from Bay Saint Louis on the east to Mobile Bay on the west and connecting with the latter by Grant's Pass. It is about 100 miles long, from 7 to 15 miles wide, from 6 to 10 feet deep and is formed by a chain of low, narrow, sandy islands, chief of which are Daphine, Petit Bois, Horn, Ship and Cat. It is traversed by steamers and coasting vessels trading between New Orleans and Mobile.