The Jona is a river in the Swiss cantons of Zürich and St. Gallen, forming partly their mutual border, and one of the main tributaries of Obersee, Lake Zurich. The Jona rises on the eastern slope of Bachtel mountain near Gibswil in the canton of Zurich. Gibswil marks the drainage divide between the rivers Jona and Töss. Flowing eastward through a small valley an…The Jona is a river in the Swiss cantons of Zürich and St. Gallen, forming partly their mutual border, and one of the main tributaries of Obersee, Lake Zurich. The Jona rises on the eastern slope of Bachtel mountain near Gibswil in the canton of Zurich. Gibswil marks the drainage divide between the rivers Jona and Töss. Flowing eastward through a small valley and passing an impressive waterfall, the river changes its direction towards south by a ravine, which is crossed by a viaduct of the Tösstalbahn. From there, it continues southward until Wald, where the Jona turns to the west, dividing the municipalities of Dürnten and Rüti, then passing the village of Tann and Rüti in the so-called Tannertobel. Once again, it changes its direction, flowing now southward again, slightly meandering through Rüti and the so-called Joner Wald, where it is followed by the Wallisellen–Uster–Rapperswil railway line. In the Jona Forest, the river follows the cantonal border between St. Gallen and Zurich. It underneaths the Oberland Autobahn, at the same time also reaching the canton of St. Gallen and the Rapperswil-Jona municipality. After flowing in a nearly straight line through the former village center of Jona, it is crossed by the Rapperswil–Ziegelbrücke railway line before it finally flows out into Obersee, the upper section of Lake Zurich, forming a small river delta at Stampf lido near Busskirch.
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