In the Hajar Mountains between Dubai and Fujairah,
United Arab Emirates is builds many tunnels in Hajar mountains. Total 16 kilometres. Hajar mountains lay between Dubai and Fujairah.
CNN values UAE tunnel accomplishments
https://edition.cnn.com/travel/article/etihad-rail-uae-megaproject-spc-intl/index.html
cover tunnel photo by: Matt Brown from London, England / CC BY
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https://edition.cnn.com/travel/article/etihad-rail-uae-megaproject-spc-intl/index.html
UAE's first national rail network 'has the potential to transform the economy'
edition.cnn.comA new rail network stretching across the United Arab Emirates could have a big impact.