PARTICULARLY SENSITIVE SEA AREA A PSSA is an environmentally sensitive area in which and around which mariners should exercise extreme caution. See U.S. Coast Pilot volume 10 for information regarding this area. PAPAHANAUMOKUAKEA MARINE NATIONAL MONUMENT The Papahanaumokuakea Marine National Monument and the Midway Atoll, Pearl and Hermes Atoll, and Lisianski Island Special Preservation Areas, are protected areas. See 50 CFR 404 or Chapter 2, U.S. Coast Pilot 10.