off S tip of Culross I., in NE end of Port Nellie Juan, 22 mi. SE of Whittier, Chugach Mts. 0.7 mile wide.
Named in 1910 by U.S. Geological Survey (USGS) for Samuel Applegate who discovered and mapped Port Nellie Juan in 1887. His report, "The third or Unalaska district," appears in the 1890 Census (1893, p. 81 to 90).