A tombolo is a geographical feature that refers to a sandbar or spit of land that connects an island to the mainland or to another island. This formation typically occurs due to the accumulation of sediment transported by currents and waves, which gradually builds up over time. Tombolos can create a unique ecosystem and are often characterized by their distinct shape and the way they bridge landmasses. A well-known example of a tombolo is the one connecting the Isle of Portland to the mainland in Dorset, England.
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