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The Janon is a small river that rises in Mont Pilat in the Massif Central of France near to Saint Étienne. It runs for through mostly built-up country to join the Gier at Saint-Chamond. The valley of the Janon and the Gier is a natural line of communication between the coal mines of Saint Étienne and the port of Givors on the Rhone. For many years there were plans to build a canal along this line. A westward extension to the Loire would link the Mediterranean with the Atlantic, but this never materialized. In 1833 the first railway in France was opened along the line of the Janon and Gier. ==Geography== The Janon is a tributary of the Gier, which in turn is a tributary of the Rhone. It is long. The Janon from Terrenoire to Saint-Chamond, and then the Gier from Saint-Chamond to Givors, create a valley in the coal basin between the Pilat massif to the south and the Riverie chain of the Monts du Lyonnais to the north. The catchment basin of the Janon is , with a mean altitude of . 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Janon」の詳細全文を読む スポンサード リンク
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