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
Phu Phan Mountains Kaen, Nong Bua Lamphu, Udon Thani, Sakon Nakhon, Nakhon Phanom, Kalasin, Roi Et, Maha Sarakham, and Mukdahan Province. The highest elevation of the Phu Phan Range is the 641 m high summit known as Phu Lang Ka. It is in Nakhon Phanom Province. Other important peaks are 624 m high Phu Mai Hia in Mukdahan Province and the 563 m high summit known as Phu Langka Nuea in Nakhon Phanom Province. The hills are mostly deforested, although patches covered with mixed deciduous forest remain in zones spread across the range. Phu Phan Royal Palace is in the area, as is