This flows in a generally southwest direction past the town of Patrimonio then northwest to enter the sea beside Punta di Saeta.

From this point, a steep limestone ridge contains the south of the lower valley, and ends in the rocky headland Punta di Saeta.

[4] It is found in depressions cut by erosion into the underlying Nebbio nappe, and consists of pebble conglomerate and very coarse- to coarse-grained sandstone.

Above the Fium Albino Formation are rocks of the Late Carboniferous–Permian Volcanic Succession and finally Upper Schistes Lustrés in the higher land.

Further upstream, there are trees such as Italian alder (Alnus cordata), black poplar (populus nigra) and South European flowering ash (Fraxinus ornus).

[2] In October 1981, Bogidiella cyrnensis, a new amphipoda species of the family Bogidiellidae was found in fine gravel and silt in the river bed under the D333 road bridge.