The Detroit-Windsor Tunnel connecting the USA and Canada
The Simplon Tunnel connecting Italy and Switzerland
The Hormuz Tunnel connecting Iran and the UAE
The Karawanks Tunnel connecting Austria and Slovenia
The Hawar Tunnel connecting Qatar and Bahrain
The Umeå-Vaasa Tunnel connecting Sweden and Finland
The Channel Tunnel connecting France and the UK
The Tasman Tunnel connecting Australia and New Zealand
The Olše/Olza Tunnel connecting Czechia and Poland
The Flensborg Tunnel connecting Germany and Denmark
The Gibraltar Tunnel connecting Spain and Morocco
The Fréjus Road Tunnel connecting France and Italy