Nhoi Mountain

Nhoi Mountain (also known as An Hoach Mountain) rises about 5 kilometers southwest of Thanh Hoa city and has been an important stone quarry and religious site for over a thousand years. The dark metamorphic stone extracted here was used in royal construction projects across northern Vietnam, and the mountainside still bears carved inscriptions and reliefs from the 11th to 15th centuries.

Several shrines and small temples are scattered across the lower slopes, connected by paths through secondary forest. The mountain is an easy half-day trip from the city — most visitors combine it with a meal along the Ma River, which runs past the southern base. The carving inscriptions are the main interest for those who can read classical Vietnamese or Chinese; for those who can't, the walk and the views toward the river plain justify the trip on their own.

things to do sight
A story
Nhoi Mountain has been quarried for its distinctive dark green stone since at least the 11th century. The stone — sometimes called Thanh Hoa green stone or An Hoach stone — was used for grinding tools, pillars, and architectural ornaments across the Red River Delta kingdoms. Inscriptions carved into the cliffs document quarrying operations from the Ly dynasty period, making it one of the few places in Vietnam where medieval industrial history is still visibly readable in the landscape.