Lào Cai Province than with snowing conditions. Fog and frost are a common phenomenon in the province. Lào Cai is a mountainous region. In the northwest of the province is Phan Xi Păng (also called Fansipan; elevation , snow covered during winter season), Vietnam's highest mountain. It is located in the Hoàng Liên Sơn and the Hoàng Liên National Park. The Sa Pa Mountains form the western part of the province. While the province is drained by over 100 rivers, the main river that bisects the province is the Red River, (), the most significant river of northern Vietnam, which flows out of
Pang Xi the Governor of Yi Province. During this time, Liu Zhang appointed Pang Xi as the Administrator (太守) of Baxi Commandery (巴西郡; around present-day Langzhong, Sichuan) and ordered him to lead troops to attack his rival, Zhang Lu, in Hanzhong Commandery. Although Pang Xi never managed to make any territorial gains in Hanzhong Commandery, Liu Zhang still left him in charge of Baxi Commandery to guard against possible advances by Zhang Lu. Liu Zhang also arranged for his eldest son, Liu Xun (劉循), to marry Pang Xi's daughter. As time passed, Pang Xi became increasingly arrogant because he believed that Liu