The Westernmost U.S. National Park: Haleakalā on Maui

The westernmost unit of the U.S. National Park System is Haleakalā National Park on the island of Maui, Hawaiʻi.

Key Details

• Coordinates: Summit ~20.7° N, 156.2° W.
• Meaning of Name: "House of the Sun" in Hawaiian.
• Features: Massive shield volcano (dormant, last eruption ~1790), 3,055 m (10,023 ft) summit, enormous erosional "crater" (actually a valley), rare silversword plants, endangered nēnē (Hawaiian goose), petroglyphs.
• Districts: Summit District (sunrise viewing, astronomy, hiking) and Kīpahulu District (coastal, ʻOheʻo Gulch pools, waterfalls).

Other Western Extremes

• Westernmost continental park: Olympic National Park, Washington (Cape Alava ~124.7° W).
• Westernmost state high point in a park: Denali (Denali NP, Alaska ~151° W).
• Westernmost territory park: National Park of American Samoa (~170° W).

But for the 50 states, Haleakalā claims the sunset.