Mã Pì Lèng, located in Hà Giang, is known as one of the four magnificent "great peaks" in the northern mountainous region of Vietnam. Along with Ô Quy Hồ Pass, connecting Lào Cai and Lai Châu, Pha Đin Pass, linking Sơn La and Điện Biên, and Khau Phạ Pass in Yên Bái, they form a breathtaking chain of passes awaiting explorers. The Mã Pì Lèng Pass, also known as...