The difficulty of accessing the region overland from the eastern part of China and the foggy climate hindering the accuracy of Japanese bombing of the Sichuan Basin, made the region the stronghold of Chiang Kai-Shek's Kuomintang government during 1938-45, and led to the Bombing of Chongqing.
What are some reasons for the lack of accurate Japanese bombing during the Second Sino-Japanese War in the Sichuan Basin?
The difficulty of accessing the region overland from the eastern part of China and the foggy climate