Tam Co Cave is located in Tan Trach Commune, Bo Trach District, Quang Binh Province, along Road 20 - Quyet Thang, where US military aircraft once relentlessly bombed to sever this vital supply route. Spanning 125 km and connecting Phong Nha (Quang Binh) to Aky, Ta Le, and Phulanhich (Laos), this road became a critical arterial route for transporting weapons, food, and fuel to the Southern battlefield during the war. Consequently, the young volunteers on duty had to face danger every single day.

The special significance of Tam Co Cave lies in its strategic role along the Truong Son Trail. During the anti-American resistance war (1955-1975), Road 20 - Quyet Thang was a vital transportation artery, helping carry weapons, food, and forces from the North to the South. This cave, about 20m deep and 10m wide, served as a safe shelter for soldiers and young volunteers before enemy bombs. Today, it is not only a historical relic but also a spiritual tourism highlight, contributing to the preservation of national cultural heritage.


