Grand Ecaille, LouisianaGrande Ecaille is an island located in the parish of Plaquemines, Louisiana, United States. It is in Lake Grand Ecaille. It was the site of a sulphur factory operated by the Freeport Sulphur Company and built in 1933.GeographyThe island is located at, approximately west of Port Sulfur and 71 kilometers from New Orleans. It is only above sea level, making it an area prone to flooding.