Lake Clark National Park & Preserve ~ http://www.nps.gov/lacl/
One of a handful of national park units that counts as two (2) - yes, two - units towards the total of 390 NPS units, since it has separate Congressional authorizations for its National Park and its National Preserve designations. Others like this include Denali, Glacier Bay, Katmai, and Wrangel-St. Elias.