Col du Berthiand

Leyssard (French pronunciation: [lɛsaʁ]) is a commune in the Ain department in eastern France.

Peyriat (French pronunciation: [pɛʁja] ) is a commune in the Ain department in eastern France.

Bolozon (French pronunciation: [bɔlozɔ̃]) is a commune in the Ain department in eastern France. Cize—Bolozon station has rail connections to Bourg-en-Bresse and Oyonnax.

Nurieux-Volognat (French pronunciation: [nyʁjø vɔlɔɲa]) is a commune in the Ain department in eastern France. It was established in 1973 by the merger of the former communes Mornay and Volognat.

Nurieux station (French: Gare de Nurieux) is a French railway station located in the commune of Nurieux-Volognat, Ain department in the Auvergne-Rhône-Alpes region. Established at an elevation of 484 meters, the station is located at kilometric point (KP) 33.468 on the Ligne du Haut-Bugey, between the stations of Cize—Bolozon and Brion—Montréal-la-Cluse.

Serrières-sur-Ain (French pronunciation: [sɛʁjɛʁ syʁ ɛ̃], literally Serrières on Ain) is a commune in the Ain department in eastern France.

Ceignes (French pronunciation: [sɛɲ] ) is a commune in the Ain department in eastern France.

The Ange, less often called the Lange, is a river in the Ain department, eastern France. It is a 20.7-kilometre (12.9 mi) left tributary of the Oignin. It flows into the Rhône by the river Ain.

Challes-la-Montagne (French pronunciation: [ʃal la mɔ̃taɲ]) is a commune in the Ain department in eastern France. The commune was formerly called Challes and was officially renamed on 7 July 2006.

Cize—Bolozon station (French: Gare de Cize—Bolozon) is a French railway station located in commune of Bolozon, Ain department in the Auvergne-Rhône-Alpes region. As its name suggests, that station also serves the nearby commune of Cize. It is located at kilometric point (KP) 25.061 on the Bourg-en-Bresse—Bellegarde railway. Originally opened in 1876, the station was closed in 2005 for renovations along the Haut-Bugey railway as well as reconstruction of the station, prior to re-opening in 2010. As of 2020, the station is owned and operated by the SNCF and served by TER Auvergne-Rhône-Alpes trains.

Cize (French pronunciation: [siz]) is a commune in the Ain department in eastern France.

Brion (French pronunciation: [bʁijɔ̃] ) is a commune in the Ain department in eastern France. The name comes from the Latin word Bria meaning fortress, and it is home to a ruined castle. Brion—Montréal-la-Cluse station has rail connections to Bourg-en-Bresse and Oyonnax.