Has another name “Thay Rampart” (Master Rampart), the Dao Duy Tu Rampart was built from 1630 to 1662 on the purpose of improving defend during Trinh-Nguyen War (17th – 18th century). Located in the northern center of Quang Binh, the rampart has its rich history not only by its value during 50-year civil war but also by its important attractions through 400 years.

This huge embankment, 34-kilometer long and consists of three smaller ramparts, the Truong Duc, Tran Ninh (or Dau Mau) and Truong Sa, was built in 1630 under the rule of Dao Duy Tu (1572-1634), a famous high-ranking mandarin of the Nguyen lords.

It took four years to complete the system. Made of layered clay and stones, the structure is 6m high and 6m wide at the bottom.

Wars and farther time have taken their toll, and the impressive defense system that once protected the Nguyen lords’ reign from the attacks of the Trinh lords can now only be seen along the Nhat Le River. The 12-kilometer long Tran Ninh rampart is one of the few vestiges of the Dao Duy Tu rampart.