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Matt McIntosh/NOAA

National Marine and Great Lakes Sanctuaries’ impact extends far beyond their boundaries. Sanctuaries are vital to understanding how climate change and ocean acidification is impacting our waters; conserving rare, endangered and threatened species; preserving our maritime heritage and culture; and, supporting local and regional economies.



American Samoa

Map not to scale

National Marine Sanctuary

Marine National Monument

Proposed Sanctuary

  • 13

    national marine sanctuaries

  • 2

    marine national monuments

  • 620,000+

    total square miles in Atlantic, Pacific and Great Lakes waters

  • 2

    nominations in the designation process

  • 84,750+

    annual participants in sanctuaries’ learning programs

  • $8 Billion

    generated annually for local communities’ economies

  • 137,000+

    annual hours of volunteer service at sanctuaries

  • 1

    National Marine Sanctuary Foundation