2025 Map of Timbalier Island

About this map

Timbalier Island and its surrounding archipelago define this maritime landscape along the boundary of Terrebonne Parish and Lafourche Parish. The map reveals a dynamic coastal environment where the open waters of the Gulf of America meet sheltered estuaries like Timbalier Bay and Terrebonne Bay. This 2025 survey highlights the shifting nature of these barrier landforms, including Brush Island, Caillou Island, and the scattered Pelican Islands. Navigational channels are central to the geography of this region, with Caillou Pass and Little Pass Timbalier serving as critical breaks in the barrier chain. For those studying the evolution of the Louisiana coast, the proximity of Casse-tete Island to the parish line illustrates the ongoing interplay between administrative boundaries and changing island morphology.