Bogna (river)

The Bogna is an Alpine torrent of the Ossola in northern Italy. It flows through the Val Bognanco (to which it gives its name) and into the river Toce near the city of Domodossola as a right tributary. The river starts at Monte Bardo, has a length of about 12 miles, and is known as an "unjust river" (Italian: iniquo fiume) for the destructive floods it had caused in Domodossola for centuries.

As the river runs through the entire Bognanco Valley and crosses the municipalities of Bognanco, Domodossola and Crevoladossola. A 1300 m long wall, the muraccio, was built in the late 18th century to protect the city of Domodossola from the floods of the river. In the 19th century, a remarkable bridge, a masterpiece of architecture, stood over Bogna.