When you come to the Northwest on every occasion of the ripe rice season, you will hear the people here passing on this sentence: "Nhat Thanh, Nhi Lo, Tam Than, Tu Tac" to praise the four most famous big granaries. Northwest. Muong Than field in Muong Than district, Lai Chau province with a total agricultural production area of ​​about 2000 hectares, this place is also known as "Fairy field". Each season of Muong Than always has its own beauty, if the water season falls, it is filled with green patches, and the ripe rice season is dyed in a beautiful golden color.