By the Karst or Carso Mountains.
Trieste is situated at the northeast angle of the Adriatic Sea, on the Gulf of Trieste, and is picturesquely built on terraces at the foot of the Karst hills.
Along the whole northern rim of Bosnia, as also in the fluvial and Karst valleys (poljes), are found diluvial and alluvial formations, interrupted at one place by an isolated granite layer.
They descend in parallel ridges of grey Karst limestone, south-westwards to the sea; their last summits reappear in the multitude of rocky islands along the Dalmatian littoral.
Above sea-level, in a mountainous limestone region of Karst formation.
The Triglav is the dividing range between the Alps and the Karst Mountains, and its huge mass also forms the barrier between three races: the German, the Slavonic and the Italian.
Austria possesses a fairly great number of rivers, pretty equally distributed amongst its crown lands, with the exception of Istria and the Karst region, where there is a great scarcity of even the smallest rivers.
In the Croatian Karst the seven streams of the Lika unite and plunge into a rocky chasm near Gospic, and the few small brooks of this region usually vanish underground in a similar manner.
In the Karst it is liable to sudden and violent changes, and especially to the bora, a fierce N.N.E.
A great portion of Istria belongs to the Karst region, and is occupied by the so-called Istrian plateau, flanked on the north and east by high mountains, which attain in the Monte Maggiore an altitude of 4573 ft.