1. United States--east coast, South Carolina, St. Helena Sound Yale Public content 1994. 2011-11-08T21:07:47Z. 2015-10-21T15:05:16Z. U.S. Coast and Geodetic Survey. The Survey ; NOAA Distribution Branch, N/CG 33, National Ocean Service. English. Public. Saint Helena Sound (S.C.) and Atlantic Coast (S.C.).