This area is at the Columbia River mouth, bounded on the west by a line running northeast/southwest between the red lighted Buoy #4 (46°13′35″N. lat., 124°06′50″W. long.) and the green lighted Buoy #7 (46°15′09"N. lat., 124°06′16″W. long.); on the east by the Buoy #10 line, which bears north/south at 357° true from the south jetty at 46°14′00″N. lat., 124°03′07″W. long. to its intersection with the north jetty; on the north by a line running northeast/southwest between the green lighted Buoy #7 to the tip of the north jetty (46°15′48″N. lat., 124°05′20″W. long.) and then along the north jetty to the point of intersection with the Buoy #10 line; and on the south by a line running northeast/southwest between the red lighted Buoy #4 and the tip of the south jetty (46°14′03″N. lat., 124°04′05″W. long.), and then along the south jetty to the point of intersection with the Buoy #10 line.