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tombolo
A tombolo, from the Italian ''tombolo'', derived from the Latin ''tumulus'', meaning 'mound', and sometimes translated as ''ayre'', is a deposition landform in which an island is attached to the mainland by a narrow piece of land such as a spit or bar. Once attached, the island is then known as a tied island. Several islands tied together by bars which rise above the water level are called a tombolo cluster.〔Glossary of Geology and Related Sciences. The American Geological Institute, 1957〕 Two or more tombolos may form an enclosure (called a lagoon) that can eventually fill with sediment. A tombolo may be considered to be a type of isthmus.
==Formation==
The shoreline moves toward the island (or detached breakwater) due to accretion of sand in the lee of the island where wave energy and longshore drift are reduced and therefore deposition of sand occurs.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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