The St. Immerthal
and the Münsterthal,
in the canton of Bern
in Switzerland, are separated by a rocky barrier of the Jura, in which is the cleft through which the road leads from Biel
It is supposed by some writers to have been a natural cleft in which the Romans formed their road, as a Roman inscription [p. 1.795]
on the rock shows; but the reading of it is said to be doubtful.
The place is called the Pierre Pertuse
or Pertuis (Pertusa).
According to D'Anville (Notice,
&c.), the inscription contains the words VIA DVCTA PER MONTEM DVRVVM; and he adds that the mountain keeps its name Durvau.
According to the inscription, a IIVIR COL. HELVET. superintended the work; the colonia is probably Aventicum (Avenche