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Tombolo A tombolo is a deposition landform such as a spit or bar which forms an isthmus between an island or offshore rock and a mainland shore, or between two islands or offshore rocks. They usually form because the island causes wave refraction, depositing sand and shingle carried in suspension where the waves meet. Long shore drift may also contribute material, or even be the principal contributor of material, as in the case of Chesil Beach which connects the Isle of Portland to Dorset in England. See also External links
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