# Sơn Đoòng Cave

- **Country:** Vietnam
- **Coordinates:** 17.456944, 106.287500
- **Depth:** max. 150 m
- **Length:** approx. 9 km
- **Survey:** 2009, British/Vietnamese
- **Geology:** Permo-Carboniferous limestone
- **Hazards:** Underground river|website=https://sondoongcave.info}}
- **Location:** Quảng Trị province, Vietnam
- **Discovery:** 1990 by Hồ Khanh
- **Other Name:** Hang Sơn Đoòng
- **Entrance Count:** 2

This expedition, conducted between April 10 and 14, 2009, performed a survey of the cave and gave its volume as . They estimated that the overall length of the cave system exceeded .

![Photo of Sơn Đoòng Cave](https://upload.wikimedia.org/wikipedia/commons/5/51/Son_Doong_Cave_5.jpg)

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