Below you will find the solution for: 12 1/2 miles long the Simplon Tunnel through these European mountains was then the longest in the world Jeopardy .
Since you already solved the question 12 1/2 miles long the Simplon Tunnel through these European mountains was then the longest in the world which had the answer THE ALPS, you can simply go back at the main post to check the other answers. You can do so by clicking the link here Jeopardy April 21 2020
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