Natural beauty of Mau Son mountain, Lang Son province, Vietnam in winter morning. This is a high mountainous region located in the Northeast region of Vietnam, including more than 80 mountains with an average altitude of 800-1000m above sea level, average temperature of about 15°C, cool climate all year round, usually fog appeared and clouds covered the mountains. Mau Son is home to many Vietnamese ethnic minorities, notably the Dao people with their own unique cultural features. Mau Son is also the first place in Vietnam to receive the Northeast monsoon every year. In winter, the temperature in Mau Son many times drops below 0 degrees Celsius, with ice and snow falling, a rare thing in a tropical country like Vietnam.