Seerenbach Falls, Three-tiered waterfall system in canton St. Gallen, Switzerland.

Seerenbach Falls is a three-part cascade system in canton St. Gallen with the central section dropping approximately 305 meters, making it Switzerland's second-highest waterfall. The water plunges over steep rock faces and creates a spectacular natural display in this mountainous terrain.

The three-step cascade was first measured in April 2006; before that survey, the Staubbach Fall in Lauterbrunnen was considered higher. The river cave behind the Rinquelle was explored between 1953 and 1981. Since then the falls have been listed in the federal inventory of landscapes and natural monuments of national importance (BLN 1613 Speer – Churfirsten – Alvier).

The name comes from the Seerenbach, the creek the falls form, which drains into Lake Walen; the Rinquelle spring joins the lowest cascade and adds a fourth fall of 48 m. The falls and spring lie on the Walensee-Nordroute hiking trail between Weesen and Quinten, and form part of the federal inventory of landscapes and natural monuments of national importance (BLN 1613 Speer – Churfirsten – Alvier).

The hike to reach the falls starts from Weesen and takes about three to four hours for a round trip covering roughly ten kilometers. The terrain is steep and can be slippery, particularly after rain, so visitors should wear proper footwear and allow adequate time.

Behind the lowest section of the falls, the water merges with the Rinquelle, a karst spring that emerges from a massive underground cavern. This cavern extends roughly 3000 meters deep into the Churfirsten mountains and transforms the waterfall into a window onto a hidden subterranean world.