The Linth (pronounced [ˈlɪnt] "lint") is a Swiss river that rises near the village of Linthal in the mountains of the canton of Glarus, and eventually flows into the Obersee section of Lake Zurich.

The river rises to the south-west of the village of Linthal, at the foot the Tödi mountain (elevation 3,614 metres or 11,857 feet).

In Schwanden, the Linth is joined by one of its principal tributaries, the Sernf, which drains the south-eastern part of the canton of Glarus.

This caused frequent floodings and backing up of water which made the level of Lake Walen rise several meters and turned the whole countryside into swamps.

[2] The river regulation put an end to the floodings, lowered the level of Lake Walen by some 5.4 meters which greatly improved living conditions for the population, and dried up the swamps, resulting in 20 km2 arable land in the Linth plain.