Traditionally considered the boundary between the Albula and Silvretta Alps, the pass crosses the watershed / drainage divide between the basins of the rivers Rhine and Danube.

Since 1999, the range can be traversed by rail as well, although at a drastically lower elevation, through the Vereina Tunnel.

The line, operated by the Rhaetian Railway, connects Klosters with Susch and Lavin and runs about 5-7 kilometres northeast of the Flüela road, parallel to it.

An NGO, Pro Flüela Verein, was established in 1990 to extend the opening outside the summer months.

It raises money from membership fees, and grants from the cantonal government and local communes.