Songhua Jiang is one of the most famous rivers in China, which is also the mother river of the city. Even though it is very cold outside, sometimes reaching below 30 degree, people can do a lot of fun activities on the frozen river of Songhau Jiang, such as slipping on snow and ice. All the water of Songhua Jiang has been frozen very deeply, people can walk from one side to another side, what's more, the heavy car can ride on the river. People can take frozen ice from Songhua Jiang to make many creatures, such as animals, castles, buildings and so on. This is the reason why Harbin is called iced city in China.