I want to know the answer to the following question:
What are the 4 main rivers in Sichuan?
All the background I'm provided with is that "The Yangtze River and its tributaries flows through the mountains of western Sichuan and the Sichuan Basin; thus, the province is upstream of the great cities that stand along the Yangtze River further to the east, such as Chongqing, Wuhan, Nanjing and Shanghai.". Is that enough to answer the question?