I want to know the answer to the following question:
What natural obsticles stalled the Japanese offensive against the Chinese?
All the background I'm provided with is that "In addition, Japanese control of northern and central China was somewhat tenuous, in that Japan was usually able to control railroads and the major cities ("points and lines"), but did not have a major military or administrative presence in the vast Chinese countryside.". Is that enough to answer the question?
Answer: no