Figure 42. (A) Landsat satellite image of south Florida shows individual tile boundaries (blue rectangles) of this regional study in the Florida Keys National Marine Sanctuary. Tile 2 is highlighted. (B) Index map shows locations of named reefs and shoals in the upper Keys and northeastern middle Keys, delineated by dashed lines. Red rectangles show geographic boundaries of Tiles 1 and 2, with Tile 2 and its geographic sites highlighted. Sanctuary boundary is in red; shelf-margin contour (blue) is in meters.