
Belle Isle rises from the marshy lowlands of St. Mary Parish, serving as a prominent landform in an environment dominated by shifting water and wetlands. This coastal landscape is defined by the heavy hydrologic influence of Wax Lake Outlet and the complex web of channels including New Pass, Coalboat Pass, and Wax Lake Pass. These waterways represent the active deltaic processes shaping the Louisiana coastline, where sediment-rich waters interact with the Gulf of Mexico.
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1935 · Belle Isle
USGS Topo · 1:31,680
1937 · Bayou Sale
USGS Topo · 1:62,500
1941 · Belle Isle
USGS Topo · 1:62,500
1945 · New Orleans
USGS Topo · 1:250,000
1954 · Belle Isle
USGS Topo · 1:62,500
1957 · Bayou Sale
USGS Topo · 1:62,500
1957 · Point Au Fer
USGS Topo · 1:62,500
1963 · New Orleans
USGS Topo · 1:250,000
1966 · New Orleans
USGS Topo · 1:250,000
1966 · Lake Salve
USGS Topo · 1:24,000