Longest Tunnels in the World
Key Findings
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Delaware Aqueduct leads in Tunnel length (kilometres) with 137.
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Average Tunnel length (kilometres): 81.63 · median: 75.56.
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Gap: Delaware Aqueduct is 2.3× larger than Guangzhou Metro Line 18.
About This Dataset
Longest Tunnels in the World
The longest tunnels in the world are not the famous rail crossings most people picture: water-supply tunnels run far further underground. This chart ranks completed tunnels of all types by length in kilometres; tunnels still planned or under construction are excluded.
Analysis
The Delaware Aqueduct is the longest tunnel in operation at 137.0 kilometres, 1.14 times the 120.0 kilometres of the Päijänne Water Tunnel. 6 of these 12 are water-supply tunnels, which is the point of the chart: rail and road tunnels dominate public attention, but the longest bores ever dug carry drinking water. Together the 12 tunnels shown run 980 kilometres underground, and the shortest here still stretches 58.3 kilometres.
Data Insights
Numbers, trends & sources behind this chart
Methodology & source
- Data source
- Wikipedia - List of longest tunnels
- Coverage
- 12 entities · 12 observations
- Measure
- Tunnel length (kilometres)
- Last updated
- 10 September 2026
- Compiled by
- The ANYSTAT team, from the source above
How the figures are calculated
- Values use the measure and unit named on this page. Consult the dataset description and cited source for coverage, definitions and any unit conversions. Displayed values may be rounded for readability.
- Entities are ranked highest-first on their value.
Data Sources & References
All external sources cited in this dataset
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