To amend the National Marine Sanctuaries Act to prescribe an additional requirement for the designation of marine sanctuaries off the coast of Alaska.

This bill amends the National Marine Sanctuaries Act to prohibit the Department of Commerce from designating as a national marine sanctuary an area of the marine environment off the coast of Alaska seaward of the high tide line unless an Act of Congress requires Commerce to make the designation and prescribes the boundaries of the designated area.