Simplon Tunnel
geographical name
tunnel about 12 miles (19 kilometers) long through Monte Leone (tallest mountain in the Lepontine Alps) near the Simplon Pass
Cite this Entry
“Simplon Tunnel.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/Simplon%20Tunnel. Accessed 5 Dec. 2025.
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