Monitor National Marine Sanctuary was created in 1975.
Channel Islands National Marine Sanctuary was created in 1980.
Stellwagen Bank National Marine Sanctuary was created in 1992.
Olympic Coast National Marine Sanctuary was created in 1994.
Fagatele Bay National Marine Sanctuary was created in 1986.
Cordell Bank National Marine Sanctuary was created in 1989.
Monterey Bay National Marine Sanctuary was created in 1992.
Florida Keys National Marine Sanctuary was created in 1990.
Gulf of the Farallones National Marine Sanctuary was created in 1981.
Gray's Reef National Marine Sanctuary was created in 1981-01.
Hawaiian Islands Humpback Whale National Marine Sanctuary was created in 1992.
The Monitor Sanctuary site is a column of water one-mile in diameter centered on the remains of the sunken Civil War ironclad "Monitor". Pi R squared =
The area of Channel Islands National Marine Sanctuary is 3,807.283 square kilometers.