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List of longest tunnels in the world
This list of longest tunnels in the world ranks tunnels that are at least long. Only continuous tunnels are included, pipelines (also buried) are excluded. The longest have been constructed for water distribution, followed by tunnels for railways. Both uses are highly sensitive to gradients.
==World's longest tunnels (in use)==
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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