Sitka Naval Operating Base and U.S. Army Coastal Defenses in Sitka, Alaska was listed on the United States National Register of Historic Places and designated a National Historic Landmark in 1986. Alternative or associated names are Sitka, the Causeway, and Mt. Edgecumbe School. Located on Baranof Island, Sitka (or Japonski Island), it was declared a National Historic Landmark on August 11, 1986.