Boulder Park, National Natural Landmark in Douglas County, Washington, United States
Boulder Park contains numerous glacial erratics and haystack rocks scattered across the Waterville Plateau of the Columbia Plateau geological formation.
The site marks the southern terminus of the Okanogan ice lobe from 17,000 years ago, when glacial movements shaped the current landscape.
The geological features of Boulder Park provide researchers and students with direct evidence of glacial processes during the last Ice Age.
Visitors can explore the park through walking trails that wind between the granodiorite and gneiss boulders transported by ancient glacial movements.
The combination of glacial erratics and haystack rocks demonstrates two different formation processes within the same geographical location.
Location: Washington
GPS coordinates: 47.87860,-119.80200
Latest update: July 25, 2025 06:28
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