Nam Sách

Nam Sách lies among the waterways of the eastern Red River delta, where villages and fields occupy the alluvial plain. The scholar Mạc Đĩnh Chi came from Lũng Động in this country and served the Trần court, earning a reputation for learning and integrity. After the Mạc family came to power in the sixteenth century, it built a commemorative hall on the site of his former home.

The later city of Haiphong lies here.