The provinces in Region 4 are important geographical locations, with Lào Cai and Hà Giang bordering with China to the North, and Vĩnh Phúc and Phú Thọ bordering with Hà Nội to the South.
The provinces in Region 4 are important geographical locations, with Lào Cai and Hà Giang bordering with China to the North, and Vĩnh Phúc and Phú Thọ bordering with Hà Nội to the South.