East Rockland Key is an island in the lower Florida Keys about 4 miles east of Key West.
Map of East Rockland Key, Florida 33040, USA
U.S. 1 (or the Overseas Highway) crosses the edge of the key at approximately mile markers 8-9.5, between Boca Chica Key and Big Coppitt Key.
It is located directly across the Overseas Highway from Rockland Key.
References
East Rockland Key Wikipedia(Text) CC BY-SA