Ghalajeh tunnel (Persian: تونل قلاجه) or Arba'een tunnel is a tunnel half of which is located in Eyvan County in Ilam province and the other half in Gwawar District of Gilan-e Gharb County in Kermanshah province of Iran.
Inaugurated in 2017 with a length of 2.500 meters, it was the third-longest tunnel in Iran.
By eliminating Ghalajeh Mountain Pass, the tunnel has made the route 15 km shorter.
[1][2][3] It is part of road 17 (Iran).
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