# Hölloch

- **Country:** Switzerland
- **Coordinates:** 46.976639, 8.788389
- **Mark:** Gfi-set01-cave.svg
- **Depth:** 1033 m
- **Length:** 211.229 km
- **Geology:** Limestone
- **Location:** Canton of Schwyz, Switzerland
- **Discovery:** 1875
- **Show Cave:** 1906
- **Mark Width:** 10
- **Label Position:** left

The explored length of the cave increased from in 1952 to by 1968. It was the first cave in the world where the explored length reached 100 km. Until the linkage of the Flint Ridge Cave System to the Mammoth Cave System was discovered in 1972, it was believed to be the largest cave system in the world.

**Source:** https://en.wikipedia.org/wiki/Hölloch_Cave (Wikipedia, CC BY-SA)