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The area covered by Ollon borders the Rhône on the southwest side, and rises up the mountainside as far as Chamossaire.
Ségny is situated in the east of the department, in a district of the Lake Geneva / River Rhône basin known as the Pays de Gex.
Its source is located in the commune of Échenevex in the Ain department and ends in the river Rhône at the village of Russin in the canton of Geneva of Switzerland.
Working upstream, the River Rhône turns to the east near Lyon, and forms part of the boundary between the Alps and the Jura that ends at Lake Geneva.