Thủy Vĩ

Thủy Vĩ occupied the upper Red River frontier, where the route from Yunnan entered Đại Việt through a landscape of mountains and river valleys. It formed part of Quy Hóa under successive Vietnamese dynasties. At Bảo Thắng, exchange across the border brought traders to the river; by the late eighteenth and early nineteenth centuries, markets and trading streets had grown along this busy frontier corridor.

The later city of Lào Cai lies here.