Rapperswil-Jona–Technikum

Rapperswil-Jona–Technikum is one of the 111 serial sites of the UNESCO World Heritage Site Prehistoric pile dwellings around the Alps, of which are 56 located in Switzerland. Located on a small former island on upper Lake Zürich in Rapperswil, a locality of the municipality of Rapperswil-Jona in the Canton of St. Gallen. Due to its location on a former island at the medieval Heilig Hüsli bridge chapel, the site sometimes is also referred to Rapperswil Heilighüsli or Inseldorf, meaning island village.

The site is located on a former island on upper Lake Zürich between the former Technicum university and the so-called Heilig Hüsli bridge chapel in Rapperswil. Situated at the Seedamm, an isthmus between the Zürichsee and the Obersee lake area, the former island settlement was in close vicinity to the prehistoric lake crossings, and neighboured by three other Prehistoric pile dwelling settlements: Freienbach–Hurden Rosshorn, Freienbach–Hurden Seefeld and Rapperswil-Jona/Hombrechtikon–Feldbach. Because the lake has grown in size over time, the original piles are now around 3 metres (10 ft) under the water level of 406 metres (1,332 ft). The settlement comprises 0.92 hectares (2.27 acres), and the buffer zone including the lake area comprises 49.1 hectares (121.33 acres) in all.