The tunnel is 5,760 metres (18,900 ft) long and lies south-west of Lake Walen, under the Kerenzerberg Pass.

Traffic from Zürich to Sargans must pass through the tunnel, whilst traffic in the opposite direction runs along the shores of the Walensee through six short tunnels originally built for a railway.

The railway now runs through the 4 km (2.5 mi) long Kerenzerberg Rail Tunnel, which is roughly parallel to the road tunnel.

[citation needed] Transportation of dangerous goods through the Kerenzerberg tunnel is prohibited.

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