Columnar basalt at Steamboat Rock State Park, eastern Washington.

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Photo credit: © Greg Vaughn / Alamy / Afripics
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Keywords: 10040430, america, american, banks, basalt, columbia, columnar, columns, coulee, eastern, formation, geological, geology, grand, greg, lake, landscape, lava, nature, northwest, northwestern, outdoors, pacific, park, plateau, rock, scenic, state, steamboat, travel, usa, vaughn, washington, west, western