: a hill of sand near an ocean or in a desert that is formed by the wind
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At Tunnel Park, a concrete tunnel was built to go straight through a sand dune to provide access to Lake Michigan for swimming, sunbathing, and picnicking.—Patricia Doherty, Travel + Leisure, 13 May 2026 As the tallest living sand dune system on the Atlantic Coast, the state park is a hotspot for hang gliding, kite flying, and sunset watching.—Tara Massouleh McCay, Southern Living, 9 May 2026 At Town Neck Beach in Sandwich, the February blizzard dramatically reshaped the coastline, pushing back the sand dune, leaving behind a steep drop to the entrance of the beach and tearing down the public access staircase.—Aaron Parseghian, CBS News, 11 Mar. 2026 After dying, Alna’s body was quickly covered by a sand dune, accounting for its fine level of preservation.—Reuters, NBC news, 26 Feb. 2026 See All Example Sentences for sand dune